how would i solve x+y=-2, & 2x-3x=-9

Question

it would be helpful if I could do this live

 

Answer 1

Substitution method works every time

 

find value of one variable from one equation and plug it in other equation

 

x + y = -2 therefore  x = -2 -y

 

plug this value in second equation

 

2(-2-y) - 3y = -9

 

-4 -2y - 3y = -9

 

-4 -5y = -9

 

-5y = -5

y = 1

 

plug value y into first equation and get value of x

 

x + 1 = -2

 

x = -3

 

:)