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d1i1m1o1n [39]
3 years ago
6

Using the substitution P=1/x and Q=1/y.

Mathematics
1 answer:
erma4kov [3.2K]3 years ago
5 0

Step-by-step explanation:

2p + q = 3 \\ p - 5q = 7 \\  \\ multiply \: the \: second \: equation \: by \: 2 \\  2p - 10q = 14 \\ 2p - 10q - (2p + q) = 14 - 3 \\ 2p - 10q - 2p - q = 11 \\  - 11q = 11 \\ q =  - 1 \\  \\ 2p + q = 3 \\ 2p - 1 = 3 \\ 2p = 4 \\ p  = 2

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