Question

Solution for the equation 21 − 3(a − 7) = a + 20

Answer 1

Answer:

Step-by-step explanation:

equation ⇒

21−3(b−7)=b+20

21−3b−3(−7)=b+20

21−3b+21=b+20

42−3b=b+20

22=4b

b=  

4

22

​  

 

b=  

2

11

​  

 

Given line 5x−y=1

slope of line =  

−1

−5

​  

=5

we have to take a line perpendicular  

to this line

PLEASE MARK AS BRAINLIEST

Answer 2

GIVEN, 21 − 3(a − 7) = a + 20

21 - 3a - 21 = a+ 20

- 3a = a + 20

-3a - a = 20

- 4a = 30

a = 20/-4

a = -5