Question

∠x and ∠y are supplementary angles. ∠y measures 139°. what is the measure of ∠x?

Explanation:

Step1: Recall supplementary - angle property

Supplementary angles add up to 180°. So, $\angle x+\angle y = 180^{\circ}$.

Step2: Solve for $\angle x$

Given $\angle y = 139^{\circ}$, then $\angle x=180^{\circ}-\angle y$. Substitute $\angle y = 139^{\circ}$ into the equation: $\angle x=180 - 139$.
$\angle x = 41^{\circ}$

Answer:

$41$