40 + ( x - 600 ) * 0.35 = 50 + ( x - 600 ) * 0.1
40 + 0.35 x - 600 * 0.35 = 50 + 0.1 x - 600 * 0.1
40 + 0.35 x - 210 = 50 + 0.1 x - 60
0.35 x - 170 = 0.1 x - 10
0.35 x - 0. 1 x = - 10 + 170
0.25 x = 160 Divide both sides by 0.25
x = 160 / 0.25 = 160 * 4
x = 640
Remark :
Dividing by 0.25 is equal to multiply by 4 becouse
1 / 0.25 = 4
y = 40 + (x - 600)*0.35
y = 50 + (x - 600)*0.10
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