5x-2 = 70
⇒ (x-2) log 5 = log 70
⇒ x = log 70/log 5 + 2
≈ 4.640
(You can use any base you like for the logs, as long as you use the same base for both of them.)
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x1:y1 = x2:y2 4:-2 = x2:5 x2 = (4*5)/-2 x2 = -10
2.5
x = +5 or -5
Implicit: x2 + 2y = 5 Explicit : y = (5 - x2)/2
x = +5 or x = -5