Question

2 x = 3y y=2x+4
me ajudem por favor

Answer 1

$\left \{ {{2x=3y} \atop {y=2x + 4}} \right. \ \textless \ =\ \textgreater \ \left \{ {{2x = 3(2x+4)} \atop {-----}} \right. \ \textless \ =\ \textgreater \ \left \{ {{2x=+6x + 12} \atop {----}} \right. \ \textless \ =\ \textgreater \ \left \{ {2x-6x=12} \atop {---}} \right.$


$\left \{ {{-4x=12} \atop {----}} \right. \ \textless \ =\ \textgreater \ \left \{ {{x = 12/(-4)} \atop {----}} \right. \ \textless \ =\ \textgreater \ \left \{ {{x=-3} \atop {y = 2*(-3)+4}} \right. \ \textless \ =\ \textgreater \ \left \{ {{x = -3 } \atop {y=-2}} \right.$

Soluções x = -3 e y = -2

Answer 2

2x = 3y
y = 2x/3

2x + 4 = y
2x + 4 = 2x/3
3. (2x + 4) = 2x
6x + 12 = 2x
12 = -4x
x --> -3

2x = 3y
2.-3 = 3y
-6/3 = y 
y --> -2