Question

Find the value of x.

Answer 1

x = 12 and x = 10

Explanation:

The sum of the 3 angles in a triangle = 180°

Sum the given angles and equate to 180

(6)

39 + 53 + 4 + 7x = 180, that is

96 + 7x = 180 ( subtract 96 from both sides )

7x = 84 ( divide both sides by 7 )

x = 12

(7)

6x - 5 + 75 + 5x = 180, that is

11x + 70 = 180 ( subtract 70 from both sides )

11x = 110 ( divide both sides by 11 )

x = 10

Answer 2

Problem 6: x = 12

Problem 7: x = 10

Explanation:

Problem 6:

39 + 4 + 7x + 53 = 180

39 + 4 + 7x + 53 - 39 - 4 - 53 = 180 - 39 - 4 - 53

7x / 7 = 84 / 7

x = 12

Answer: x = 12

Problem 7:

5x + 6x - 5 + 75 = 180

5x + 6x - 5 + 75 - 75 + 5 = 180 - 75 + 5

11x / 11 = 110 / 11

x = 10

Answer: x = 10