NCERT Solutions for Class 7 Maths Chapter 4 Simple Equations Ex 4.2
NCERT Solutions for Class 7 Maths Chapter 4 Simple Equations Ex 4.2
These NCERT Solutions for Class 7 Maths Chapter 4 Simple Equations Ex 4.2 Questions and Answers are prepared by our highly skilled subject experts.
NCERT Solutions for Class 7 Maths Chapter 4 Simple Equations Exercise 4.2
Question 1.
Give first step you will use to separate the variable and then solve the equation:
(a) x – 1 = 0
(b) x + 1 = 0
(c) x – 1 = 5
(d) x + 6 = 2
(e) y – 4 = -7
(f) y – 4 = 4
(g) y + 4 = 4
(h) y + 4 = – 4
Answer:
(a) x – 1 = 0
Adding 1 on both sides, we get.
x – 1 + 1 = 0 + 1
x = 1
The solution is x = 1.
(b) x + 1 = 0
Subtracting 1 from both sides, we get.
x + 1 – 1 = 0 – 1
x = -1.
The solution is x = – 1
(c) x – 1 = 5
Adding 1 to both sides, we get.
x – 1 + 1 = 5 + 1
x = 6
The solution is x = 6.
(d) x + 6 = 2
Subtracting 6 from both sides, we get
x + 6 – 6 = 2 – 6
x = – 4
The solution is x = – 4.
(e) y – 4 = – 7
Adding 4 on both sides, we get
y – 4 + 4 = -7 + 4
y = – 3
The solution is y = – 3.
(f) y – 4 = 4
Adding + 4 on both sides, we get
y – 4 + 4 = 4 + 4
y = 8
The solution is y = 8.
(g) y + 4 = 4
Subtracting 4 from both sides, we get
y + 4 – 4 = 4 – 4
y = 0
The solution is y = 0.
(h) y + 4 = – 4
Adding – 4 on both sides, we get
y + 4 – 4 = -4 -4
y = – 8
The solution is y = – 8.
Question 2.
Give first step you will use to separate the variable and then solve the equation:
Answer:
Question 3.
Give the steps you will use to separate the variable and then solve the equation:
m = 2
The solution is m = 2
Question 4.
Answer:
Solve the following equations:
Answer:
(j) 2q – 6 = 0
Adding 6 on both sides, we get
2q – 6 + 6= 0 + 6
2q = 6
(k) 2q + 6 =0
Subtracting 6 from both sides, we get
2q + 6 – 6 = 0 – 6
2q = – 6
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