Question

My work is saying solve for the value of a

Answer 1

Using the definition of suplementary angles we know that the angle that contains a and the 75° added together are 180°

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

solve the equation for a

`\begin{gathered} 81+9a=180 \\ 9a=180-81 \\ 9a=99 \\ a=(99)/(9) \\ a=11 \end{gathered}`