Question

Set-up an equation and
find the variable
Ravi subtracts thrice the number of
pencils he has from 80 , he finds the results to be 8.​

Answer 1

Answer :

24

Solution :

Let the number of pencils he had be x .

A/Q ,

80 - thrice the number of pencils = 8 .

80 - 3x = 8

80 - 8 = 3x

72 = 3x

Hence the equation can be : 3x = 72

Solving the variable :

3x = 72

x = $\dfrac{72}{3}$

x = 24

Hence , the number of pencils Ravi had was 24 .

_____________________

• An equation with degree of polynomial 1 is called linear equation .

• Linear equation can be in one variable ,two variables , etc .

• The number of variable gives the number of solution of the linear equation .

Answer 2

Answer:

80-3x=8. x=24

Step-by-step explanation:

let the no. of pencil b x

80-3x=8

80-3x=8

-3x= 8-80

x = -72 ÷ -3

x= 24