This is a little bit different from the normal way of substituting, but it is still substution!
x - 2y = -2
3x - 2y = 2
(x - 2y) - (3x - 2y) = (x - 2y) - (3x - 2y)
Since x - 2y = -2 , we can substitute -2 in for x - 2y .
(x - 2y) - (3x - 2y) = (-2) - (3x - 2y)
Since 3x - 2y = 2 , we can substitute 2 in for 3x - 2y .
(x - 2y) - (3x - 2y) = (-2) - (2)
Distribute the -1 .
x - 2y - 3x + 2y = -2 - 2
Combine like terms.
-2x = -4
Divide both sides by -2 .
x = 2
Now we know what x is. Let's plug this value into the first equation to find y .
2 - 2y = -2
Subtract 2 from both sides.
-2y = -4
Divide both sides by -2 .
y = 2
This is a little bit different from the normal way of substituting, but it is still substution!
x - 2y = -2
3x - 2y = 2
(x - 2y) - (3x - 2y) = (x - 2y) - (3x - 2y)
Since x - 2y = -2 , we can substitute -2 in for x - 2y .
(x - 2y) - (3x - 2y) = (-2) - (3x - 2y)
Since 3x - 2y = 2 , we can substitute 2 in for 3x - 2y .
(x - 2y) - (3x - 2y) = (-2) - (2)
Distribute the -1 .
x - 2y - 3x + 2y = -2 - 2
Combine like terms.
-2x = -4
Divide both sides by -2 .
x = 2
Now we know what x is. Let's plug this value into the first equation to find y .
2 - 2y = -2
Subtract 2 from both sides.
-2y = -4
Divide both sides by -2 .
y = 2