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Solve for X please explain

Solve for X please explain-example-1

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Answer:

Explanation:

add the 2 equations:

3x+18+4x+15

simplify:

7x+33

we know that all angles on a straight line is 180 degrees.

7x+33=180

solve that equation:

7x=147

x=21

from here substitute x=21 into both equations.

3x+18

3x=63

63+18=81

left angle is 81 degrees

4x+15

4x=84

84+15=99

right angle is 99 degrees

we can check this by adding them both: 99+81=180

its right as all angles on a straight line add to 180, which these do.

hope this helped

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