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There is no one solution to this problem. For example: y = x2 y = 5x y = x + 20 y = 2x / 5 + 23 These are just four of the infinite set functions that would give "y" a value of 25 when x = 5.
(20 - x)/5
x = 8y = -42x - y = 2(8) - (-4) = 16 + 4 = 20
-5
3y - 20 = 8ySubtract 3y from each side:-20 = 5yDivide each side by 5:-4 = y