you mean: x+3x+3=x+18
so x=5
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(2, 3)
5x+18 = 2x+9 5x-2x = 9-18 3x = -9 x = -3 and y = 3
X2 + 3X - 18 = 0What two factors of - 18 add up to 3 ??(X - 3)(X + 6)============so, by the zero sum rule,X = 3X = - 6
x = 0
3x + 7y = 3*x + 7*y = 3*6 + 7*4 = 18 + 28 = 46