The equation which cannot be solved in integers is
(a) 5y - 3 = - 18
(b) 3x - 9 = 0
(c) 3z + 8 = 3 + z
(d) 9y + 8 = 4y - 7
Solution:
Let’s solve each of the equation to find out the correct option.
(a) 5y - 3 = - 18
5y = - 18 + 3
y = - 15/5
y = -3, which is an integer
(b) 3x - 9 = 0
3x = 9
x = 9/3
x = 3, which is an integer.
(c) 3z + 8 = 3 + z
3z - z = 3 - 8
2z = -5
Z = -5/2, which isn’t an integer
(d) 9y + 8 = 4y - 7
9y - 4y = -7 - 8
5y = -15
y = -15/5
y = - 3, which is an integer
Hence out of the four options, the correct option is (c) 3z + 8 = 3 + z, which cannot be solved in integers.
✦ Try This: The equation which cannot be solved in integers is (a) 5y - 3 = 18, (b) 2x - 8 = 0, (c) 3z + 5 = 8 + z, (d) 6y + 8 = 4y
Let’s solve each of the equation to find out the correct option.
(a) 7y - 3 = 18
7y = 18 + 3
y = 21/7
y = 3, which is an integer
(b) 2x - 8 = 0
2x = 8
x = 8/2
x = 4, which is an integer.
(c) 3z + 5 = 8 + z
3z - z = 8 - 5
2z = 3
Z = 3/2, which isn’t an integer
(d) 6y + 8 = 4y
6y - 4y = - 8
2y = - 8
y = - 8/2
y = - 4, which is an integer
Hence out of the four options, the correct option is (c) 3z + 5 = 8 + z, which cannot be solved in integers.
☛ Also Check: NCERT Solutions for Class 7 Maths Chapter 4
NCERT Exemplar Class 7 Maths Chapter 4 Problem 5
The equation which cannot be solved in integers is (a) 5y - 3 = - 18, (b) 3x - 9 = 0, (c) 3z + 8 = 3 + z, (d) 9y + 8 = 4y - 7
Summary:
Hence out of the four options, the correct option is (c) 3z + 8 = 3 + z, which cannot be solved in integers
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