Observe o exemplo para responder às questões:
a) x+y=20
x-y= 15
b) x+y=30
x-y=10
c) x+y=40
x-y=10
d) x+y=45
x-y=25
a) x+y=20
x-y= 15
b) x+y=30
x-y=10
c) x+y=40
x-y=10
d) x+y=45
x-y=25
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x-y= 15
2x = 35 ==> x= 35/2
y = 20 - x ==> y = 20 - 35/2 ==> y = (40-35)/2 ==> y = 5/2
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b) x+y=30
x-y=10
2x = 40 ==> x= 20
y = 30 - x ==> y = 30 - 20 ==> y = 10
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c) x+y=40
x-y=10
2x = 50 ==> x= 25
y = 40 - x ==> y = 40 - 25 ==> y =15
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d) x+y=45
x-y=25
2x = 70 ==> x= 35
y = 45 - x ==> y = 45 - 35 ==> y = 10
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