Solve by substitution or elimination;

x+2y=-1

x-y=5

I used substitution

x-y=5

x-y=5

+y + y

x = y+5

x+2y=-1

y+5+2y=-1

3y+5=-1

-5 - 5

3y=-6

:3 : 3

y=-2

x - (-2) = 5

x+2=5

-2 - 2

x=3

x=3 y=-2

I would love to use substitution (It is simplier that way I guess)

solve your system of equations.

x+2y=-1; x-y=5

Solve x+2y=-1 for x:

x+2y+-2y=-1+-2y (Add - 2y to both sides)

x=-2y-1

Substitute (-2y-1) for x in x-y=5:

x-y=5

-2y-1-y=5

-3y-1=5 (Simplify both sides of the equation)

-3y-1+1=5+1 (Add 1 to both sides)

-3y=6

-3y/-3 = 6/-3 (Divide both sides by - 3)

y=-2

Substitute (-2) for y in x=-2y-1:

x=-2y-1

x = (-2) (-2) - 1

x=3 (Simplify both sides of the equation)

So the answer is (x = 3 and y = - 2)