2 years ago

Write and solve an equation to find the value of x. Show your work.

Mathematics

1 answer:

brilliants [131]2 years ago

8 0

Answer:

x = 9

Step-by-step explanation:

(13x + 2) + (5x -7 ) + (3x-4) = 180°( sum of angles in a triangle)

13x + 2 + 5x - 7 + 3x - 4 = 180

13x + 5x +3x + 2 - 7 - 4 = 180

21x - 9 = 180

add 9 to both sides

21x - 9 + 9 = 180 + 9

21x = 189

Divide through by 21

x = 9

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