Question

If the degree measure of an angle is 40° less than 3 times the degree measure of its supplementary angle, what is the degree measure of the angle?
A.
50°
B.
55°
C.
125°
D.
130°

Answer 1

x = 3 (180 - x) - 40
solve for x

Answer 2

can you solve this equation?

Answer 3

so the equation would x = 540 - 3x - 40

Answer 4

right

Answer 5

do i add 40 to 540

Answer 6

no subtract 540 - 40 = 500
and equation becomes
x = -3x + 500

Answer 7

now we aim to get all x terms on the left:
add 3x to both sides of = sign:
x + 3x = -3x + 3x + 500
4x = 500

can you continue?

Answer 8

divide by 4 and you get 125

Answer 9

right...

Answer 10

C is correct - good job