Hello Jay
4=-x-y
2x-y=10
We need to solve 4=-x-y for x
Now add x to both sides
4+x=-x-y+x
x+4==-y
Add -4 to both sides
x+4-4=-y-4
x=-y-4
Now we need to substitute -y-4 for x in 2x-y=10
2x-y=10
2(-y-4)-y=10
To find the result of this factor we need to simplify
-3y-8=10
Add 8 to both sides so we can start finding the y value
-3y-8+8=10+8
-3y=18
Divide both sides by -3 so we can find the y value
-3y/-3=18/-3
y=-6
Now let's find the x value by substitute -6 for y in x=-y-4
x=-y-4
x=-(-6)-4
x=2
Answer: x=2 and y=-6
I hope that's help:0