Question

x + y = 100
x - y = 40

Answer 1

x - y = 40

2x=140
x=140/2
x=70

X - y = 100

70 + y = 100
Y = 100 - 70
Y = 30

Answer 2

x + y = 100
x - y = 40
-------------
2x = 140

x = 140/2

x = 70



x + y = 100

70 + y = 100

y = 100 - 70

y = 30


S = {30,70}


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Gannicus
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