Question

Find m A.)21*
B.)19*
C.)48*
D.)132*

Answer 1

C.) 48 degrees

Explanation:

First you need to find x. We already know that is a straight line or 180 degrees, so you will make an equation to solve which is: (7x-1)+(3x-9)=180

To solve this equations you have to take away parenthesis and group like terms:

7x+3x-1-9=180 turns into 10x-10=180

Then you have to add ten to both sides then divide by ten and the answer is x=19

then you just have to find the angle of ABC by solving 3x-9, substituting 19 for x

Then the answer to that is 48 degrees

Answer 2

x = 19

Explanation:

These angles are supplementary meaning they add up to 180°.

7x - 1 + 3x - 9 = 180

10x - 10 = 180

10x = 190

x = 19