Question

What does x equal? ** use algebraic methods**

Answer 1

8x - 1 + 3x + 4 + 3x + 9 = 180
14x + 12 = 180
14x = 168
X = 12

Answer 2

x = 12

Explanation:

Pre-Solving

Given

We are given a triangle, with the measures of the angles being 8x-1, 3x+9, and 3x+4.

We want to find the value of x.

Solving

All the measures of the angles in a triangle add up to 180.

Therefore, 8x - 1 + 3x + 4 + 3x + 9 = 180

Now, combine like terms.

14x + 12 = 180

Subtract 12 from both sides.

14x = 168

Divide both sides by 14.

x = 12