Question

5(x-2)+7=9+4x
4(x-y)-5y=39

Answer 1

Відповідь:

5(x - 2) + 7 = 9 + 4x

5x - 10 + 7 = 9 + 4x

5x - 3 = 9 + 4x

5x - 4x = 9 + 3

x = 12

4(x - y) - 5y = 39

4(12 - y) - 5y = 39

48 - 4y - 5y = 39

-9y + 48 = 39

-9y = 39 - 48

-9y = -9

y = -9 / -9

y = 1

x = 12 і y = 1