Question

Help me find the value of x

Answer 1

A) x = 20

Explanation:

The horizontal line is a straight angle, so it is 180°, and the angles on the left is right, so it is 90°.

180 - 90 = 90, which means the two smaller angles total up to 90°.

So, 90 = 4x - 10 + x

Simplify: 90 = 5x - 10

Add: 100 = 5x

Divide: x = 20

Answer 2

We know that the entire angle is equal to 90 degrees (look at image below). This means that the sum of 4x-10 and x is 90 degrees, so you can make a formula:

4x - 10 + x = 90

Now you can solve for x

5x - 10 = 90

5x = 100

x = 20

Hope this helped!