Easy Substitution System

What is the solution to the following system?

^{y = 5}

^{-3x + 4y = 8}

• (5, 7)

• (4, 5)

• (-3, 5)

• (-4, -20)

Tags

CCSS.HSA.REI.C.9

What is the solution to the following system?

^{x = 4y}

^{x - 4y = 0}

• (0, 0)

• no solutions

• infinite solutions

• (4, 0)

Tags

CCSS.8.EE.C.8B

What is the solution to the following system?

^{x = -2y}

^{3x + 4y = -8}

• (-2, -8)

• (4, 3)

• (-2, 4)

• (-8, 4)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Which option shows the CORRECT substitution for this system?

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Why does substitution help us solve a system of equations?

• It changes one variable to an expression using the other variable, so we can solve an equation that only has one variable at a time.

• It creates a problem with fewer steps.

• It puts both equations in slope-intercept form for easy graphing.

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

TRUE or FALSE:

When both equations have the same variable isolated

(both y = or both x = ),

substituting the first into the second ends up looking like

you just set the two equal to each other.

• TRUE

• FALSE

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Which option shows the CORRECT substitution for this system?

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Which option shows the CORRECT substitution for this system?

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Which option shows the CORRECT substitution for this system?

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Which option shows the CORRECT substitution for this system?

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6