5 u - 15 = 8 p
6 u - 24 = 9 p
Find the following values.
- 1 u
- 1 p
5 u - 15 = 8 p --- (1)
6 u - 24 = 9 p --- (2)
Make p the same.
(1) x 9
45 u - 135 = 72 p --- (3)
(2) x 8
48 u - 192 = 72 p --- (4)
(4) = (3)
48 u - 192 = 45 u - 135
48 u - 45 u = 192 - 135
3 u = 57
1 u = 57 ÷ 3 = 19
(b)
Substitute 1 u = 19 into (1).
5 u - 15 = 8 p
5 x 19 - 15 = 8 p
95 - 15 = 8 p
8 p = 80
1 p = 80 ÷ 8 = 10
Answer(s): (a) 45; (b) 10