Question

How to solve x=7y+3 and 9y-x=1 using subsituation method and showing work.

Answer 1

x=17, y=2. (17, 2).

Explanation:

x=7y+3

9y-x=1

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9y-(7y+3)=1

9y-7y-3=1

2y-3=1

2y=1+3

2y=4

y=4/2

y=2

x=7(2)+3

x=14+3

x=17

Answer 2

x = 25/2

y = 3/2

Explanation:

x = 7y + 3

9y - x = 1

9y- (7y + 3) = 0

2y - 3 = 0

2y = 3

y = 3/2

9(3/2) - x = 1

27/2 - x = 1

-x = -25/2

x = 25/2