3C. Solving a System of Equations by Substitution

1. What is the first step when solving this system by substitution?

• $2x-2=-x+7$

• $2x-2-x+7=y$

• $2\left(-x+7\right)-2=y$

• $y=2x-2=-x+7$

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Solve this system by substitution

• $\left(4\ ,\ -2\right)$

• $\left(-2\ ,\ 4\right)$

• $\left(-1\ ,\ -9\right)$

• $\left(2\ ,\ 0\right)$

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What is the first step to solving this system by substitution?

• $10\left(8x+6\right)-5y=30$

• $10x-5\left(8x+6\right)=30$

• $10x-5y=8x+6$

• $8\left(10x-5y\right)+6=30$

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Solve the system by substitution

• $\left(9\ ,\ 3\right)$

• $\left(-3\ ,\ -27\right)$

• $\left(3\ ,\ 9\right)$

• $\left(-27\ ,\ -3\right)$

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6