You cannot solve 1 linear equation in 2 unknown variables. You need at least two independent equations.
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5x+10=60 5x=50 5/5=1 50/5=10 So the answer is 10
x2 + 5x = 60 x2 + 5x + 25/4 = 60 + 25 / 4 (x + 5/2)2 = 265/4 x + 5/2 = (265/4)1/2 x = -5/2 ± √265 / 2 x = -(5 ± √265) / 2
-5x + y = -12- 3x + 6y = -12Since both of expressions have a value of -12, their sum is - 24. This is true only whenx = 20/9 and y = -8/9.-5x + y = -12y = 5x - 12- 3x + 6y = -12-3x + 6(5x - 12) = -12-3x + 30x - 72 = -1227x = 60x = 60/27x = 20/9y = 5x - 12y = 5(20/9) - 12y = 100/9 - 12y = (100 - 108)/9y = -8/9
72
x = 10