x2 - x = 20
x2 - x - 20 = 0
(x - 5)(x + 4) = 0
x - 5 = 0 and x + 4 = 0
So, x = 5 ans x = -4
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X=1
(20 - x)/5
factorise (x-5)(x+4)=0 Hence x= 5 or -4
Using the quadratic equation formula: x = 8.42 or x = -1.42
If you are solving for y, it is fine. If you are solving for x, divide both sides by x and the equation should be x = y/x