Question

sabendo que y=3x+7, calcule o valor de x na equaçao 2x-3y=23

Answer 1

y=3x+7
2x-3y=23

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