Question

Determine which line the point (1, -2) lies on. y = x + 5 y = 2x + 1 y = 2x - 4 y = x -2

Answer 1

y = 2x - 4

Explanation:

Given point (1, -2) so x = 1, y = -2

Just plug in and verify

y = x + 5

• y = 1 + 5 = 6 ≠ -2 , no

y = 2x + 1

• y = 2*1 + 1 = 3≠ -2 , no

y = 2x - 4

• y = 2*1 - 4 = -2, yes

y = x -2

• y = 1 - 2 = -1 ≠ -2 , no