Question

4x+5y=1, 5x+7y=5 сделайте

Answer 1

4x + 5y = 1,5x + 7y = 5
4x - 1,5x = 7y - 5y = 5
2,5x = 2y = 5
x =0,5
y = 0,4

Вроде-бы так.