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2x+y= 87...2
y= 50+x...a
sustituir 2 en a.
2x=50-x
x=49/2
x=24.5
sustituir x en a
y=50-24,5
y= 25.5
sustituir 1
x+y=50
24.5+25.5= 50
sustituir en 2.
2x+y=87
2(24.5)+25.5=87
51+25.5=