Question

Me ajudem por favor

Answer 1

|x + y = 25 .(-2)
|2x + 3y = 55

|-2x - 2y = -50
|2x + 3y = 25
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y = - 25


x + y = 25
x - 25 = 25
x = 25 + 25
x = 50

Answer 2

×+y=25
2x+3y=55

x=25-y
2(25-y)-3y=55

50-2y-3y=55
-5y=55-50
-5y=5(-1) nunca a incognita será negativa 
y=-5/5
y=1


x+y=25
x+(-1)=25
x=25+1
x=26