Question

urgent tell question no. 6

Answer 1

There is only q7

For that, solution is,

Given that a-3b=20°

Then a=20+3b -----1equation

As we know that the sum of angles of a triangle is 180°

Then

a+b =180°

Put the value of a from equation 1

20°+3b+b =180

4b=180-20

4b=160

b=160/4

b =40


Then the angles are

40 and 180-40=140°



I hope this will help you

Answer 2

AC forms a straight line as AB, AC are opposite rays.

We know that angles on a straight line equals a straight angle .

Now, a + b = 180°

Given, a - 3b = 20
a = 20+ 3b .

Now, (20 + 3b ) + b = 180

20 + 4b = 180

4b = 160

b = 40°

So, a = 20 + 3(40) = 140°

Hope helped!