-2? it’s been awhile sorry if it’s wrong
The answer would be 82 millimeters!
Adding the two equations
3x + 6y + 3x - 6y = 36+0
6x = 36
x = 6
.
subtracting second equation from first
(3x + 6y ) - (3x-6y) =36 -0
12y = 36
y = 3
.
therefore
x = 6 and y = 3
(6,3)
(-3x + 15) + (-3x + 2)
Simplify by combining like terms.
-6x + 17
-6x + 17