Answer:
x = 10, y = -10
Step-by-step explanation:
x + y = 0
4x + 3y = 10
To solve with substitution, we must solve one equation for a variable, then plug that into the other equation:
x + y = 0
x = -y
------
4x + 3y = 10
4(-y) + 3y = 10
-4y + 3y = 10
-y = 10
y = -10
Then we can plug the value of "y" into the first equation:
x + y = 0
x + (-10) = 0
x = 10
