OK, so
-3y + 15 - y = 39
-3y + 15 - 15 - y = 39 - 15
-3y -y = 24
-4y = 24
-y = 6
y= -6.
Hope this helps!
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The equation for 3y + 3y = -1 is 3y + 3y = -1.
It is: 15y -6y^2
(5, 1)
5y-2y= 3y+2 5y-2y-3y= 2 0y= 2
2x+3y=13 3x-y=3 x=2