Answer:
x=4, y=-2
Step-by-step explanation:
In the equation
x+2y=0
We isolate x so we just subtract 2y from both sides
x=-2y. Now we substitute that for x, in the second equation,
y-(-2y)y= 1/2(-2y)^2-2
y-( -2y^2)= 1/2(4y^2)-2
y+2y^2= 2y^2-2
y=-2
so plug that back in the first equation to solve for x.
x+2(-2)=0
x-4=0
x=4
So x=4 and y=-2
