NCERT Solutions for Class 9 Maths Chapter 4
Important NCERT Questions
Linear equations in two variables
NCERT Books for Session 2022-2023
CBSE Board and UP Board Others state Board
EXERCISE 4.4
Page No:77
Questions No: 1 Part:12
(i) in one variable
(ii) in two variables
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(i) To represent the equation 2x + 9 = 0 in one variable, we will use number line.
2x + 9 = 0
⇒ x = -9/2
(ii) To represent the equation 2x + 9 = 0 in two variable, we will use Cartesian plane. Now the equation:
2x + 0.y = -9
⇒ x = (-9 – 0.y)/2
Putting y = 1, we have, x = (-9 – 0 × 1)/2 = -9/2
Putting y = 2, we have, x = (-9 – 0 × 2)/2 = -9/2
Hence, A(-9/2, 1) and B(-9/2, 2) are the two solutions of the given equation.