3x + 2y =25 is an equation, and the function f(x)=y= -1.5x + 12.5. I don't know what you mean by sum since x and y could equal different numbers.
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you need another equasion... or you could re arrange it into a straight line formula. 3x + 2y = 25 2y = -3x + 25 y = -3/2x + 25/2
33
2y+8y = 10y
x2 + 2y = 52 + 2*2 = 25 + 4 = 29
This means that 2y - 3 = 2y + 4 which is not possible.