Question

The answer is 10 but I got 12.5. can someone walk me through how to do this step by step?​

Answer 1

Answer: x = 10.

Step-by-step explanation:

Remember that all interior angles in a triangle add to 180 degrees.

Also remember that the angle measures on one side of a line add to 180 degrees. You can represent the third interior angle as 180 - (12x - 5).

Using that representation, we can solve for x:

`180 - (12x - 5) + 68 + 4x + 7 = 180`

180 - (12x - 5) is the first degree measure

68 is the second degree measure

4x + 7 is the third degree measure.

Simplifying this, we get

`-8x + 80 = 0`

x = 10.