y = 5x - 20 и y = 10x - 70
5x - 20 = 10x - 70
5x - 10x = -70 + 20
-5x = -50
x = 10
y = 5 * 10 - 20
y = 50 - 20
y = 30
ответ: (10; 30)
y = 5x - 20 и y = 10x - 70
5x - 20 = 10x - 70
5x - 10x = -70 + 20
-5x = -50
x = 10
y = 5 * 10 - 20
y = 50 - 20
y = 30
ответ: (10; 30)