Question

-5x + y = 35 and 3x + 2y = -21 How would I solve by substitution?

Answer 1

x= -7

y=0

Explanation:

you want to get one variable alone and substitute it into the other equation

in this case, get the y in -5x+y=35 alone

y=5x+35

now substitute this into 3x+2y= -21

3x+2(5x+35)= -21

3x+10x+70= -21

13x=-91

x= -7

now substitute x into one of the equations

3(-7)+2y= -21

-21+2y= -21

2y=0

y=0