Question

Solve by the addition-or-subtraction method.

10p + 4q = 2
10p - 8q = 26

Answer 1

p = 1

q = -2

Explanation:

10p + 4q = 2

10p - 8q = 26

Time the second equation by -1

10p + 4q = 2

-10p + 8q = -26

12q = -24

q = -2

Now we put -2 in for q and solve for p

10p + 4(-2) = 2

10p - 8 = 2

10p = 10

p = 1

Let's Check the answer

10(1) + 4(-2) = 2

10 - 8 = 2

2 = 2

So, p = 1 and q = -2 is the correct answer.