Solve the System by Substitution

What is the first step to solve the system by substitution?

 $_{y=7x}^{y=4x+3}$  

•  $4x+3=7x$  

•  $y=4\left(7x\right)+3$  

•  $y=7\left(4x+3\right)$  

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What is the first step to solve the system by substitution?

 $_{y=-3x}^{y=5x-24}$ 

•  $5x-24=-3x$ 

•  $y=5\left(-3x\right)-24$ 

•  $y=-3\left(5x-24\right)$ 

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What is the first step to solve the system by substitution?

$_{y=-9x+21}^{y=-2x}$

• $-2x=-9x+21$

• $y=-2\left(9x+21\right)$

• $y=-9\left(-2x\right)+21$

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What is the first step to solve the system by substitution?

 $_{y=2x}^{3x+4y=-11}$ 

•  $3x+4\left(2x\right)=-11$ 

•  $3\left(2y\right)+4y=-11$ 

•  $y=2\left(3x+4y\right)$ 

•  $3x+4y=2x$  

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What is the first step to solve the system by substitution?

 $_{2x+y=-24}^{10x=y}$ 

•  $2x+\left(10x\right)=-24$ 

•  $2\left(10x\right)+y=-24$ 

•  $y=10\left(2x+y\right)$ 

•  $10x=2x+y$  

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What is the first step to solve the system by substitution?

$_{7x+9y=-45}^{-2y=x}$

• $7\left(-2y\right)+9y=-45$

• $7x+9\left(-2y\right)=-45$

• $x=-2\left(7x+9y\right)$

• $-2y=7x+9y$

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What is the first step to solve the system by substitution?

 $_{x-5y=20}^{x=9y}$ 

•  $\left(9y\right)-5y=20$ 

•  $x-5\left(9y\right)=20$ 

•  $x=9\left(x-5y\right)$ 

•  $9y=x-5y$ 

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6