Linear Equations in One Variable CLASS 8

Which of the following is not a linear equation in one variable?

• 33y+5 = 0

• 2x+6y=9

• 11y=0

• 3x+5=8

Answer explanation

2x+6y=9

The above equation has two variables 'x' and 'y'. Therefore, it's not a linear equation in one variable.

A linear equation which is one variable in nature, has _ solution(s).

Answer explanation

Linear equation in one variabl has only one solution.

The degree of x² – 5x + 2 = x³ is:

• 2

• 1

• 0

• 3

Answer explanation

Degree is the highest power of the variable in an equation. Therefore, in the given equation, the highest degree is 3.

Find the value of x if 2x + 10 = 76.

• 33

• 53

• 43

• 64

Answer explanation

2x + 10 = 76

=> 2x = 76 – 10

=> 2x = 66

=> x = 66/2

=> x = 33

The perimeter of the rectangle is 40cm. If the length of the rectangle is 12cm, then its breadth will be:

• 4cm

• 40cm

• 8cm

• 80cm

Answer explanation

Perimeter of a rectangle= 2×(l + b)

=> 40 = 2(12+x)

=> 12+x = 40/2

=> 12+x = 20

=> x = 20-12

=> x=8 cm

Which of the following equation has x= 2 as it's solution?

• 7x=21

• 8x+2=18

• 9x+3=17

• 51-7x=7

The degree of equation x² – 9 = 2x² is

• 0

• 1

• 2

• 3

When a number is added to itself, it becomes 24. What is the number?

• 4

• 6

• 8

• 12

What should be added to -15 to get 15?

• 15

• -15

• 30

• -30

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