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4x+5y=49
por igualacion
2x-3y=-3
2x=-3+3y
x=(-3+3y)/2
4x+5y=49
x=(49-5y)/4
(-3+3y)/2=(49-5y)/4
4(-3+3y)=(49-5y)2
-12+12y=98-10y
12y+10y=98+12
22y=110
y=5
remplazamos
2x-3y=-3
2x-3(5)=-3
2x-15=-3
2x=-3+15
x=6