2p -5q=8.. 3p-7q=11 use substitution

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Bjorn Reppen asked Aug 15, 2022

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2p -5q=8.. 3p-7q=11 use substitution

Mathematics
high-school

Bjorn Reppen asked Aug 15, 2022

by Bjorn Reppen

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1 Answer

22 votes

Answer:

p = -1 q = -2

Explanation:

3p - 7q = 11 -7q = -3p + 11 q = 3/7p - 11/7

2p - 5(3/7p - 11/7) = 8

2p - 15/7p + 55/7 = 8

-1/7p + 55/7 = 8

-1/7p = 1/7

p = -1

2(-1) - 5q = 8

-2 - 5q = 8

-5q = 10

q = -2

Alex Larzelere answered Aug 19, 2022

by Alex Larzelere

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