A, B and C lie on a straight line. Given that angle

y

= 128° and angle

z

= 91°, work out

x

.

x = 37°

Step-by-step explanation:

The exterior angle of a triangle is equal to the sum of the 2 opposite interior angles .

y is an exterior angle of the triangle , then

y = x + z , that is

128° = x + 91° ( subtract 91° from both sides )

37° = x

x+91+(180-y)=180

180-128=52

x+91+52=180

143+x=180

x=37

Hope This Helps!!!

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hey there! : )

4y < -4

we need to isolate y. we can do this by simply dividing both sides by 4.

4y ÷ 4 > -4 ÷ 4

simplify.

y > -1

5 - y > 0

once again, we need to isolate y, so we can start off by subtracting 5 from both sides.

5 - y - 5 > 0 - 5

simplify.

-y > -5

divide both sides by -1.

** remember that when dividing any side by a negative, you must switch the sign! **

-y ÷ -1 < -5 ÷ -1

simplify.

y < 5

~hope i ! ~