Question

what is the value of x? 40° 140° 80° 70°

Explanation:

Step1: Find the third - interior angle

The sum of interior angles of a triangle is 180°. Let the third - interior angle be $y$. So, $y=180-(80 + 60)=40^{\circ}$.

Step2: Use the linear - pair property

Since $x$ and $y$ form a linear pair (a straight - line is 180°), then $x = 180 - y$. Substituting $y = 40^{\circ}$, we get $x=180 - 40=140^{\circ}$.

Answer:

$140^{\circ}$