Class 9, Maths, Chapter 4, Exercise 4.1, Solutions
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. (Take the cost of a notebook to be ₹ x and that of a pen to be ₹ y).
Ans:
Q.2. Express the following linear equations in the form ax + by + c = 0 and indicate the values of a, b and c in each case:
(i) $2x+3y=9.3\overline{5}$
(ii) $x-\frac{y}{5}-10=0$
(iii) –2x + 3y = 6
(iv) x = 3y
(v) 2x = –5y
(vi) 3x + 2 = 0
(vii) y – 2 = 0
(viii) 5 = 2x
Ans:
