Which of the following equations cannot be formed using the equation x = 7
(a) 2x + 1 = 15
(b) 7x - 1 = 50
(c) x - 3 = 4
(d) x/7 - 1 = 0
Solution:
Let’s solve each of the equation to find out the correct option.
(a) 2x + 1 = 15
2x = 15 - 1
x = 14/2
x = 7
(b) 7x - 1 = 50
7x = 50 + 1
x = 51/7
(c) x - 3 = 4
x = 4 + 3
x = 7
(d) x/7 - 1 = 0
x/7 = 1
x = 7
Hence out of the four options, the correct option is (b) 7x - 1 = 50
✦ Try This: Which of the following equations cannot be formed using the equation x = 2 ? (a) 2x + 1 = 5, (b) 7x - 1 = 13, (c) x - 3 = 1, (d) x - 1 = 1
Let’s solve each of the equation to find out the correct option.
(a) 2x + 1 = 5
2x = 5 - 1
x = 4/2
x = 2
(b) 7x - 1 = 13
7x = 13 + 1
x = 14/7
x = 2
(c) x - 3 = 1
x = 1 + 3
x = 4
(d) x - 1 = 1
x = 1 + 1
x = 2
Hence out of the four options, the correct option is (c) x - 3 = 1
☛ Also Check: NCERT Solutions for Class 7 Maths Chapter 4
NCERT Exemplar Class 7 Maths Chapter 4 Problem 15
Which of the following equations cannot be formed using the equation x = 7? (a) 2x + 1 = 15, (b) 7x - 1 = 50, (c) x - 3 = 4, (d) x/7 - 1 = 0
Summary:
Hence out of the four options, the correct option is (b) 7x - 1 = 50
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