Solve Simple Equations by Substitution

Which equation has x = 2 as a solution?

• 3 + x = 10

• 4x = 32

• 11 + x = 13

• 5x =25

Find the value of x : 3 (x - 2) = 9

• x = 5

• x = 8

• x = 7

• x = 9

A coupon subtracts Rs 17.95 from the price of a bag of chocolate . You pay Rs 71.80 for the chocolate bag after using the coupon. Write equation to find the original price “p” of the chocolate

• p + 17.95 = 71.80

• p + 71.80 = 17.95

• None of these

• p - 17.95 = 71.80

 

The value of the variable that we get on solving an equation is called _____

• Degree of the equation

• Co-efficient of the variable

• Solution or Root of the equation

• None of the above

Manu's father's age is 4 years more than three times Manu's age. Find Manu's age, if his father is 46 years old.

• 14

• 15

• 16

• 18

Find the value of x : 11x − 21  = 100  

• 24

• 22

• 11

• 7

y = x - 9 
y = -9

• 0, -9

• -1, 2

• -18, -9

• -81, -3

y = 5x - 4
y = x

• 0,1

• 1,1

• -1,2

• 2,3

If 7x + 4 = 25, then x is equal to ?

• 1/3

• 100/7

• 2

• 3

If 4k + 7/2 = 3, then the value of k is

• 1/8

• (-1/2)

• (-1/8)

• 1/2