class 9 maths chapter 4 exercise 4.3 question no. 5
Answers
Answer:
From the choices given below, choose the equation whose graphs are given in Fig. 4.6 and Fig. 4.7.
For Fig. 4. 6
(i) y = x
(ii) x+y = 0
(iii) y = 2x
(iv) 2+3y = 7x
Ncert solutions class 9 chapter 4-6
Solution:
The points given in the figure 4.6 are (0,0), (-1,1), (1,-1)
Substituting the values for x and y from these points in the equations, we get,
(i) y = x
(0,0) ⟹ 0 = 0
(-1, 1) ⟹ -1 ≠ 1 ————————— equation not satisfied
(1, -1) ⟹ 1≠ -1 ————————— equation not satisfied
(ii) x+y = 0
(0,0) ⟹ 0+0 = 0
(-1, 1) ⟹ -1+1 = 0
(1, -1) ⟹ 1+(-1) =0
(iii) y = 2x
(0,0) ⟹ 0 = 2×0
0 = 0
(-1, 1) ⟹ 1 = 2×(-1)
1≠ -2 ————————— equation not satisfied
(1, -1) ⟹ -1 = 2×1
-1 ≠ 2 ————————— equation not satisfied
(iv) 2+3y = 7x
(0,0) ⟹ 2+(30) = 7×0
2 ≠ 0 ————————— equation not satisfied
(-1, 1) ⟹ 2+(3×1) = 7×-1
5 ≠ -7 ————————— equation not satisfied
(1, -1) ⟹ 2+(3×-1) = 7×1
-1 ≠ 7 ————————— equation not satisfied
Step-by-step explanation:
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