Question

An equation 2x+y=8 has a solution (2a,9). What is the value of a?

Answer 1

a = -1/4

Explanation:

Substitute the given solution into the equations

2x + y = 8

2(2a) + (9) = 8

4a + 9 = 8

Rearrange to get a alone

4a = 8 - 9

4a = -1

a = -1/4

2a = 2(-1/4) = -1/2

Solution = (-1/2, 9)