Question

y + 2x = −1
3y − x = 4

Answer 1

using the first equation we can conclude that y=-2x-1 now we substitute this into our second equation
3(-2x-1)-x=4
-6x-3-x=4
-7x=7
x=-1 now we solve for we by pluggin in -1 into our first equation
y=(-2(-1))-1
y=2-1
y=1