Question

please solve it fast​

Answer 1

Step-by-step explanation:

a= 40° ( given)

2a= 2× 40= 80°

2a+ 5b = 180°

40°+ 5b = 180°

5b= 180°-40°

5b = 140°

b= $\frac{140}{5}$

b= 28°

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Answer 2

Answer:

Answer:bro please make sure that you mark my answer as brainliest other wise it will not help or support you.

Step-by-step explanation:

heres tour solutions

first of all

step 1;

5b+2a=180°(angles on a straight line)

step2;

5b=180-2a

b=180-2a. ..........(i)

5

step 3 putting the value of b in equation i

5(180-2a)= 180 - 2a

5.

now it leaves us the remainder

180-2a=180-2a

now in the same way extracting the value of a

5b-180=-2a

5b - 180= a

-2.

now putting both the values of b and a we get the answer

that

5b + 2(40°) =180°

5b + 80 =180

5b = 100

b= 100 = 20° ans.

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