U4L1 HW A2

1. Solve the system using substitution.

 $4x+7y=-4$  

 $y=4x+4$  
**Type your answer as (x,y) without using spaces. 

Answer explanation

One equation is already solved for y, so you just substitute 4x+4 in for y in the first equation. From there, distribute the 7 then combine like terms.

2. Solve the system using substitution.

 $3x-y=-4$  

 $y=-2x+4$  
**Type your answer as (x,y) without using spaces. 

Answer explanation

One equation is already solved for y, so you just substitute -2x+4 in for y in the first equation. From there, distribute the -1, then combine like terms.

3. Solve the system using substitution.

 $3x+y=15$  

 $-2x-5y=-23$  
**Type your answer as (x,y) without using spaces. 

Answer explanation

Your first step should be to solve one of the equations for either variable. 

5. Solve the system using substitution.

 $-3x+3y=12$  

 $8x+7y=13$  
**Type your answer as (x,y) without using spaces. 

Answer explanation

Your first step should be to solve one of the equations for either variable.