Question

sabendo que y=3×+7 determine o valor de × na equacao 2×-3y=23​

Answer 1

Resposta:

y=3x+7

2x-3y=23

x=?

2x-3y=23

2x-3(3x+7)=23

2x-9x-21=23

-7x=23+21

-7x=44(-1)

7x=-44

x=-44/7

y=3x+7

y=3(-44/7)+7

y=-132/7+7

y=-132+49/7

y=-83/7