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b)7y+6x=157
a)x=
b) 7y+6.()=157
7y+6.(26,4-1,2y)=157
7y+158,4-7,2y=157
-0,2y+158,4=157
-0,2y=157-158,4
-0,2y=-1,4
y=-1,4/(-0,2)
y=7
a)x=
x=90/5
x=18
Entonces, cada torta (x) cuesta 18 pesos y cada refresco (y) cuesta 7 pesos.