Question

Help pllsssssss to find the vAlue of a

Answer 1

`a=11`

Explanation:

These are supplementary angles, meaning they together make up the whole measure of the angle of a straight line. A straight line is 180°, so the sum of these has to be 180° too:

`(9a+6)+75=180`

Then just solve for a:

`9a+6+75=180\\9a+81=180\\9a=99\\a=11`

Answer 2

a = 11

Explanation:

As all angles on a straight line must add up to 180°:

(9a + 6) + 75 = 180

9a + 6 + 75 = 180

9a + 81 = 180

Subtract 81 from both sides of the equation:

9a + 81 - 81 = 180 - 81

9a = 99

Divide both sides by 9 to isolate a:

9a ÷ 9 = 99 ÷ 9

a = 11

Hope this helps!