Question

y=10-3x Qual o valor de x na equaçâo 7x-3y=18

Answer 1

y = 10 - 3x

Substituindo o valor de y:

7x - 3y = 18
7x - 3.(10 - 3x) = 18
7x - 30 + 9x = 18
7x + 9x = 18 + 30
16x = 48
x = 48/16
x = 3