Question

Solve using linear combination p-q=8 2p-q =19

Answer 1

p =11, q = 3

Explanation:

p-q=8

2p-q =19

Multiply the first equation by -1

-p+q = -8

Add this to the second equation

-p+q = -8

2p-q =19

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p = 11

Now we can find q

p -q = 8

11 -q = 8

Subtract 11 from each side

11-11-q = 8-11

-q = -3

q =3