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Answer:B *54 degrees*

Step-by-step explanation:

2x-10 + 1/2x + 20 = 180

add up like terms

2.5x + 10 = 180

subtract 10 from both sides

2.5x = 170

divide by 2.5 on both sides

x = 68

now plug in x to the (2x-10) expression [which will get you 126 degrees]

then subtract 180 - 126 to fine angle y. which should get you *54 degrees*

Answer:

y=54°

Step-by-step explanation:

   Since they are parallel we can make a equation, instead of having to work with two variables we can work with one, y is on the same side as (½x+20)°, they would equal the same amount.

So here is our equation

                                 (2x-10)+(½x+20)°=180°

we get the 180° because it is a straight angle.

Now we can solve

(2x-10)+(½x+20)°=180°

2½x+10=180°

       -10   -10

2½x=170°

÷2½   ÷2½x

x=68°

Since we said y = (½x+20) and x is 68, we can solve for y

half of 68 is 34+20=54°

                                             y=54°

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