# NCERT Solutions For Class 9 Math Chapter – 4 Exercise – 4.1 NCERT Solutions For Class 9 Math Chapter – 4 Exercise – 4.1

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Q1. The cost of a notebook is twice the cost of a pen Write a linear equation in two variables to represent this statement.

Solution:-

Let the cost of pen be y

Let the cost of notebook be x

2y = x

X – 2y = 0

This is linear equation u=in two variables in two variables to represent this statement.

Q2. Express the following linear equation in the form ax + by + c= 0 and indicate the following the value of a , b  and c in each case:

Solution:-

• 2x + 3y = 9.35
• X – y/5 – 10 = 0
• -2x + 3y = 6
• X = 3y
• 2x = -5y
• 3x + 2= 0
• Y – 2 =0
• 5 = 2x

Solution:-

• 2x + 3y = 9.35

2x + 3y – 9.35 = 0

A = 2x , b = 3 and c = -9.35

• X – y/5 – 10 = 0

A = 1 , b = -1/5 and c = -10

• -2x + 3y = 6

A = -2 , b = 3 and c = -6

• X = 3y

A = 1 , b = 3 and c = 0

• 2x = -5y

A = 2 , b = 5 and c = 0

• 3x + 2

A = 3 , b =  and c = 2

• Y – 2 = 0

A = 0 , b = 1 and c = -2

• 5 = 2x

A = -2 , b = 0 and c = 5