NCERT Class 9 Solution: Linear Equation In Two Variables (Chapter 4) Exercise 4.1

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Line ax+by+c = 0 on the coordinate plane

Equaltion of a Line Plotted on the Coordinate Plane

Line ax+by+c = 0 on the coordinate plane

(Take the cost of a notebook to be Rs and that of a pen to be Rs )

Solution:

Consider the cost of a notebook be and that of a pen be .

A linear equation has to equate the two things. According to question, the cost of a notebook is twice the cost of a pen

So,

Therefore, linear equation becomes,

.

Q-2 Express the following linear equations in the form and indicate the value of in each case:

Solution:

    • So,

    • Compare, the equation with

    • Therefore, value of and is

    • Compare the equation with .

    • Therefore, .

    • So,

    • Compare, the equation with

    • Therefore,

    • So,

    • Compare, the equation with

    • Therefore,

    • So,

    • Compare, the equation with

    • Therefore,

    • Compare, the equation with

    • Therefore,

    • Compare, the equation with

    • Therefore,

  • So,

  • Compare, the equation of

  • Therefore,