NCERT Class 9 Maths Chapter 4 Linear Equations in Two Variables Solutions
NCERT Class 9 Maths Chapter 4 Linear Equations in Two Variables Solutions Exercise 4.1 Q.1. The cost of a notebook is twice the cost of a pen. Write a linear equation in two variables to represent this statement. Ans: Let the cost of a notebook is Rs. x and cost of a pen is Rs. y. Therefore a linear equation in two variables (x and y) representing the given statement is x = 2y. Q.2. Express the following linear equations in the form a x + by + c = 0 and indicate the values of a, b and c in each case. Ans: On comparing the coefficients of x and y and also constant terms we observe that a=2,b=3 and c = – Ans: (iii) -2x+3y= 6 Ans: -2x+3y =6 in the form of ax + by +c=0 is written as -2x+3y-6=0 [Changing 6 to L.H.S.] ⇒ -2x+3y+(-6)=0 On comparing the coefficients of x and y and also constant terms we observe that a=-2, b=3 and c=-6 (iv) x = 3y Ans: x=3y in the form of ax + by + c= 0 is written as x-3y = 0 ⇒1.x+(-3)y-+0=0 On comparing the coefficients of x and y and als...