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Unit 4, Lesson 13

Solving Systems by Substitution

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Integrated Math 1

Practice

Problem 1
Student Task Statement
Identify a solution to this system of equations:

Practice

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Problem 2

Student Task Statement

Lin is solving this system of equations:

She starts by rearranging the second equation to isolate the variable: . She then substituted the expression for in the first equation, as shown:

Check to see if Lin's solution of makes both equations in the system true.
If your answer to the previous question is "no," find and explain her mistake. If your answer is "yes," graph the equations to verify the solution of the system.

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Problem 3

Student Task Statement

Solve each system of equations.

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Problem 4

Student Task Statement

Tyler and Han are trying to solve this system by substitution:

Tyler's first step is to isolate in the first equation to get . Han's first step is to isolate in the first equation to get .

Show that both first steps can be used to solve the system and will yield the same solution.

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Problem 5

ForLesson 15: Comparing Data Sets

Student Task Statement

The dot plots show the distribution of the length, in centimeters, of 25 shark teeth for an extinct species of shark and the length, in centimeters, of 25 shark teeth for a closely related shark species that is still living.

mean: 3.02 cm

standard deviation: 0.55 cm

mean: 2.32 cm

standard deviation: 0.13 cm

Compare the two dot plots using the shape of the distribution, measures of center, and measures of variability. Use the situation described in the problem in your explanation.

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Problem 6

ForLesson 8: Which Variable to Solve for? (Part 1)

Student Task Statement

Kiran buys supplies for the school’s greenhouse. He buys bags of fertilizer and packages of soil. He pays $5 for each bag of fertilizer and $2 for each package of soil, and spends a total of $90. The equation describes this relationship.

If Kiran solves the equation for , which equation would result?

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Problem 7

ForLesson 11: Connecting Equations to Graphs (Part 2)

Student Task Statement

Elena wanted to find the slope and -intercept of the graph of . She decided to put the equation in slope-intercept form first. Here is her work:

She concluded that the slope is and the -intercept is .

What was Elena’s mistake?
What are the slope and -intercept of the line? Explain or show your reasoning.

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Problem 8

ForLesson 11: Connecting Equations to Graphs (Part 2)

Student Task Statement

Find the - and -intercepts of the graph of each equation.

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Problem 9

ForLesson 12: Writing and Graphing Systems of Linear Equations

Student Task Statement

Andre is buying snacks for the track and field team. He buys pounds of apricots for $6 per pound and pounds of dried bananas for $4 per pound. He buys a total of 5 pounds of apricots and dried bananas and spends a total of $24.50.

Which system of equations represents the constraints in this situation?

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Problem 10

ForLesson 12: Writing and Graphing Systems of Linear Equations

Student Task Statement

Here are two equations:

Equation 1:
Equation 2:

Without using graphing technology:

Find a point that is a solution to Equation 1 but not a solution to Equation 2.
Find a point that is a solution to Equation 2 but not a solution to Equation 1.
Graph the two equations.
Find a point that is a solution to both equations.

<p>A blank coordinate grid with origin O. X axis negative 6 to 4, by 2’s. Y axis from negative 6 to 4, by 2’s.</p>

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Problem 11

ForLesson 17: Working with Rigid Transformations

Student Task Statement

Triangle is congruent to triangle . Describe a sequence of rigid motions that takes to , to , and to .

<p>Two congruent triangles labeled ABC and A’B’C’.</p>

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Solving Systems by Substitution

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Problem 4

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Problem 5

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Problem 7

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Problem 8

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Problem 9

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Problem 10

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Problem 11

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Lesson 13 Resources