Question

5x/12-y=9 x-3y/4=15 sustitucion

Answer 1

Respuesta:

$\left \{ {{\frac{5x}{12}-y = 9 } \atop {x-\frac{3y}{4} = 15}} \right.$

$\left \{ {{y=-9+\frac{5x}{12} } \atop {x-\frac{3y}{4}= 15 }} \right.$

$x-\frac{3(-9+\frac{5x}{12} )}{4} = 15$

$x=12$

$y=-9+\frac{5*12}{12}$

$y=-4$