Question

If the lines px = 12 and 2x + qy = 10 intersects at (1 , 1), what is the value of p + q?

Answer 1

p + q = 20

Explanation:

Given the lines intersect at (1, 1 ) then x = 1 and y = 1 make the equations true.

Consider

px = 12 with x = 1

p = 12

Consider

2x + qy with x = 1 and y = 1

2 + q = 10 ( subtract 2 from both sides )

q = 8

Hence p + q = 12 + 8 = 20