# Writing a system of linear inequalities

Use the following strategies to tailor the lesson to meet the needs of your students throughout the year Routine: Group and partner work should be used throughout the lesson so that students can help each other.

Overview In this unit students will: The goal of this unit is to extend solving equations to understanding solving systems of equations, which is defined as a set of two or more linear equations that contain the same two variables.

Student experiences are with numerical and graphical representations of solutions. Beginning work involves systems of equations with solutions that are ordered pairs of integers, making it easier to locate the point of intersection, simplify the computation, and hone in on finding a solution.

More complex systems are investigated and solved by using graphing technology. Contextual situations relevant to eighth graders add meaning to the solution to a system of equations.

Students explore many problems for which they must write and graph pairs of equations leading to the generalization that finding one point of intersection is the single solution to the system of equations.

Students connect the solution to a system of equations, by graphing, using a table, and writing an equation.

Students compare equations and systems of equations, investigate using graphing calculators or graphing utilities, explain differences verbally and in writing, and use models such as equation balances.

Problems are structured so that students also experience equations that represent parallel lines and equations that are equivalent. This will help them to begin to understand the relationships between different pairs of equations.

When the slope of the two lines is the same, the equations are either represent the same line resulting in infinitely many solutionsor the equations represent parallel lines that do not have common solutions. Solving systems in eighth grade includes estimating solutions graphically, solving using substitution, and solving using elimination.

Students gain experience by developing conceptual skills using models that develop into abstract skills of formal solving of equations.

Students also have to change forms of equations from a given form to slope-intercept form in order to compare equations. Back to Top II. Mathematical standards are interwoven and should be addressed throughout the year in as many different units and activities as possible in order to emphasize the natural connections that exist among mathematical topics.

Understand that solutions to a system of two linear equations in two variables correspond to points of intersection of their graphs, because points of intersection satisfy both equations simultaneously.

Solve systems of two linear equations in two variables algebraically, and estimate solutions by graphing the equations. Solve simple cases by inspection. Solve real-world and mathematical problems leading to two linear equations in two variables.

For example, given coordinates for two pairs of points, determine whether the line through the first pair of points intersects the line through the second pair. The first of these are the NCTM process standards of problem solving, reasoning and proof, communication, representation, and connections.

Make sense of problems and persevere in solving them. In grade 8, students solve real world problems through the application of algebraic and geometric concepts. Students seek the meaning of a problem and look for efficient ways to represent and solve it.

Reason abstractly and quantitatively.

## Graphing Inequalities

In grade 8, students represent a wide variety of real world contexts through the use of real numbers and variables in mathematical expressions, equations, and inequalities. They examine patterns in data and assess the degree of linearity of functions.

Students contextualize to understand the meaning of the number or variable as related to the problem and decontextualize to manipulate symbolic representations by applying properties of operations.

Construct viable arguments and critique the reasoning of others. In grade 8, students construct arguments using verbal or written explanations accompanied by expressions, equations, inequalities, models, and graphs, tables, and other data displays i.

They further refine their mathematical communication skills through mathematical discussions in which they critically evaluate their own thinking and the thinking of other students. In grade 8, students model problem situations symbolically, graphically, tabularly, and contextually.

Students form expressions, equations, or inequalities from real world contexts and connect symbolic and graphical representations. Students solve systems of linear equations and compare properties of functions provided in different forms. Students use scatter plots to represent data and describe associations between variables.

Students need many opportunities to connect and explain the connections between the different representations. They should be able to use all of these representations as appropriate to a problem context.

Use appropriate tools strategically.

Students consider available tools including estimation and technology when solving a mathematical problem and decide when certain tools might be helpful.

For instance, students in grade 8 may translate a set of data given in tabular form to a graphical representation to compare it to another data set.Students connect the solution to a system of equations, by graphing, using a table, and writing an equation. Students compare equations and systems of equations, investigate using graphing calculators or graphing utilities, explain differences verbally and in writing.

View Notes - Graphing Linear Inequalities from MATH Trigonomet at Insight School Of California - North Bay.

## Algebra 1 Worksheets | Systems of Equations and Inequalities Worksheets

Algebra 2 System of Linear Inequalities Writing Assignment: Graphing Systems of Linear . Create the worksheets you need with Infinite Algebra 1. Never runs out of questions; Linear Equations and Inequalities Finding slope from a graph Writing linear equations Graphing absolute value equations Graphing linear inequalities.

Exponents Exponential functions and graphs Properties of exponents (easy, hard) Writing numbers in. Algebra 1 - Graphing Linear Inequalities I've basically thrown the textbook the rest of the way out the window.

Last semester, I tried to present Algebra 1 concepts in the same order as the textbook even though my students were not using the textbook.

In this solving linear inequalities instructional activity, students solve 10 problems that include using a graphing calculator to respond to the first four questions about graphing the inequality. Systems of Equations and Inequalities • Lessons , , and Solve systems of Reading and WritingAs you read and study the chapter, fill the tabs with notes, diagrams, Explain why a system of linear equations cannot have exactly two solutions.

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Writing systems of inequalities word problem (video) | Khan Academy