Answer:
X = 0
Y = 3
Explanation:
To solve using substitution, you would solve one equation and substitute it into the other to get that x or y value, then you would use that found value on any original equation.
x+y=3 2x+2y=6
Using the first equation, if we subtract x
y = -x+3
Lets put this into the second equation
2x + 2y = 6
2x + 2(-x+3) = 6
2x + 2x + 6 = 6
4x = 0
x = 0
Now that we have X, we can plug it into any original equation. let's do the first cause it's easier
x+y=3
0+y=3
y=3
We can use the other too
2x+2y=6
2(0)+2y=6
0+2y=6
y=3