Question

please tell me how to do that ​

Answer 1

Answer:

a+b =180

a-2b=30

3b= 150

b= 50

so,

a+50=180

a=130

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Answer 2

EXPLANATION:-

We know that sum of ∠a and ∠b Is 180° by linear pair .

a-2b=30         [GIVEN]

a=30+2b----------eq-1

So we have calculated that ∠a=30+2b

Now,we know that∠ :-

∠a+∠b=180

∠a=2b+30 [by calculating]

2b+30+b=180

3b+30=180

3b=180-30

3b=150

b=150/3

b=50

Hence ∠b=50°

Now let's put the value of ∠b in the equation 1

a=30+2b  [this is equation-1]

b=50  [by calculating above]

a=30+2×50

a=30+100

a=130

So the value of ∠a is 130°

Hence ∠a=130° and ∠=50°