solve using substitution 3x+4y=-3 and x+2y=-1

Question

3x+4y=-3,x+2y=-1

Answer 1

using the second equation(because its easier), let's find x in terms of y: x=-2y-1

now, in the first equation instead of x plug -2y-1:

3(-2y-1)+4y=-3

solve for y:

-6y-3+4y=-3

-2y-3=-3

-2y=0

y=0

x=-2y-1=0-1=-1