Question

Please help me and can you write an explanation too please.

Answer 1

Answer:

$\Huge\boxed{x=42}$

Step-by-step explanation:

Hello There!

The shown angles are supplementary angles.

We know this because a straight line is split into two angles

A straight line creates a 180 degree angle so the sum of the two angles is 180

So we can use this equation to solve for x

180 = 3x + 12 + x

3x + x = 4x

180=4x+12

step 1 subtract 12 from each side

180-12=168

12-12 cancels out

now we have

168=4x

step 2 divide each side by 4

4x/4=x

168/4=42

we're left with x = 42