Question

problem 18: (first taught in lesson 30) find y. after you enter your answer press go. y =

Explanation:

Step1: Use exterior - angle property

$5x=4x + 48$

Step2: Solve for $x$

$5x-4x=48$, so $x = 48$

Step3: Find $y$ using angle - sum property

The sum of angles in a triangle is $180^{\circ}$. So $y+4x + 48=180$. Substitute $x = 48$ into $4x$, we get $4x=4\times48 = 192$. Then $y+192+48=180$, $y=180-(192 + 48)=32$

Answer:

$32$