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x=3-5y
-4+9y=3-5y
-4-3=-5y-9y
-7=-14y
-7/-14=y
Y=1/2
x=3-5y
x=3-(5·(1/2))
x=3-(5/2)
X=1/2
-x+9y=4
x+5y=3
simplificas:
9y=4
5y=3
sumas:
14y=7
y= 7/14
y=1/2
ahora reemplazas para despejar x:
x-9(1/2)=-4
x-9/2=-4
x=-8/2 +9/2
x=1/2