Question

15. If the point (5,k) lies on the line represented by the equation 2x + y = 9, the value of k is....

C) -1
D) -2
A and B where wrong. 15 points for whomever answers correctly

Answer 1

The answer is C.

Explanation:

Given that (5,k) lies on the line that has the equation of 2x + y = 9. So in order to find k, you have to substitute the coordinates into the equation :

`2x + y = 9`

Let x = 5,

Let y = k,

`2(5) + k = 9`

`10 + k = 9`

`k = 9 - 10`

`k = - 1`