Question

Подскажите, как это решить?

2a+3b/4a-5b если 17a-b/7a+8b = -5

Answer 1

(17a-b)/(7a+8b) = -5
17a - b = -35a - 40b
52a = -39b
4a = -3b
a = -0,75b

(2a+3b)/(4a-5b) = (-1,5b+3b)/(-3b-5b) = 1,5b/(-8b) = -0,1875