Question

metodo de reduccion
4y+2x=9
8x-4y=4

Answer 1

4y+2x=9
4y=9-2y
y=$\frac{9-2x}{4}$

8x-4($\frac{9-2y}{4}$)=4
8x-36+8y=4
8x+8x=4+36
16y=40
x=40/16
x=5/2

4y+2($\frac{5}{2}$)=9
4y+$\frac{10}{2}$=9
            mcm=2
8y+10=18
8y=18-10
8y=8
y=$\frac{8}{8}$
y=1