Question

The angles of a triangle are 128, 5x+10 and 9x. What is the value of x?

Answer 1

angles in a triangle total 180°

180=128+5x+10+9x
180-128-10=5x+9x
42=14x
x=3

Answer 2

The value of x is 3.

Explanation:

It is given that the angles of a triangle are 128, 5x+10 and 9x.

According to the angle sum property of a triangle, the sum of all interior angles of a triangle is 180 degrees.

`128+5x+10+9x=180`

`138+14x=180`

`14x=180-138`

`14x=42`

Divide both sides by 14.

`x=3`

Therefore the value of x is 3.