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NCERT SOLUTIONS CLASS 9 MATHEMATICS

Exercise 4.2

Q.1. Which one of the following options is true, and why? y = 3x + 5 has

(i) a unique solution, (ii) only two solutions, (iii) infinitely many solutions

Q.2. Write four solutions for each of the following equations:

(i) 2x + y = 7 (ii) πx + y = 9 (iii) x = 4y

Q.3. Check which of the following are solutions of the equation x - 2y = 4 and which are not:

(i) (0, 2) (ii) (2, 0) (iii) (4, 0) (iv) (2, 42) (v) (1, 1)

Q.4. Find the value of k, if x = 2, y = 1 is a solution of the equation 2x + 3y = k.