Question

5r-3s=16
3r+5s=30
solve by elimination method.

Answer 1

3(5r-3s= 16) = 15r-9s=48 [1]
5(3r+5s=30) = 15r+25s=150 [2]

[2] - [1]gives 34s = 102
divide by 34

s = 3

Substitute 3 for s in 1

15r-27=48 (add 27 to both sides)
15r = 75
divide 15 on both sides

r= 5

Answer s = 3, r = 5

Answer 2

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