Question

determine o valor de x sabendo que
x/20 = y/15 e x-y=2

Escolha uma:
x = 2
x = 6
x = 8
x = 14

Answer 1

$\frac{x}{20}=\frac{y}{15}$

$15x=20y$

$3x=4y$

$3x-4y=0$

$\left \{ {{3x-4y=0} \atop {x-y=2}} \right.$

$\left \{ {{3x-4y=0} \atop {4x-4y=8}} \right.$

$(4x-4y)-(3x-4y)=8-0$

$4x-4y-3x+4y=8$

$x=8$