–1 is not a solution of the equation
(a) x + 1 = 0
(b) x – 1 = 2
(c) 2y + 3 = 1
(d) 2p + 7 = 5
Solution:
Let’s solve each of the equations
(a) x + 1 = 0
The given equation is x + 1 = 0
Thus,
x = –1
(b) x – 1 = 2
The given equation is x – 1 = 2
Thus,
x = 2 + 1
x = 3
(c) 2y + 3 =1
The given equation 2y + 3 = 1
Thus,
2y = 1 – 3
y = – 2/2
y = – 1
(d) 2p + 7 = 5
The given equation 2p + 7 = 5
Thus,
2p = 5 – 7
p = – 2/2
p = – 1
Hence the correct option is (b) x – 1 = 2
Thus, –1 is not a solution of the equation x – 1 = 2
✦ Try This: 2 is not a solution of the equation
(a) x – 2 = 0 (b) x – 2 = 2 (c) 2x – 3 = 1 (d) 2y + 1 = 5
Let’s solve each of the equations
(a) x – 2 = 0
The given equation is x – 2 = 0
Thus,
x = 2
(b) x – 2 = 2
The given equation is x – 2 = 2
Thus,
x = 2 + 2
x = 4
(c) 2x – 3 = 1
The given equation 2x – 3 = 1
Thus,
2x = 1 + 3
x = 4/2
x = 2
(d) 2y + 1 = 5
The given equation 2y + 1 = 5
Thus,
2y = 5 – 1
y = 4/2
y = 2
Hence the correct option is (b) x – 2 = 2
Thus, 2 is not a solution of the equation x – 2 = 2
☛ Also Check: NCERT Solutions for Class 7 Maths Chapter 4
NCERT Exemplar Class 7 Maths Chapter 4 Solved Ex 2
–1 is not a solution of the equation (a) x + 1 = 0 (b) x – 1 = 2 (c) 2y + 3 = 1 (d) 2p + 7 = 5
Summary:
Thus, –1 is not a solution of the equation x – 1 = 2
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