Question

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Answer 1

2) a)

2x-y=9

x+y=9

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3x = 18

x = 18/3

x = 6

x + y = 9

6 + y = 9

y = 9 - 6

y = 3

c) x = 2y

3)

x + y = 10

x - y = 6

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2x = 16

x = 16/2

x = 8

x + y = 10

8 + y = 10

y = 10 - 8

y = 2

S = {8, 2}