New Learning Composite Mathematics Class 6 SK Gupta Anubhuti Gangal Algebra Chapter 7B Solution
(1) (a) x + 7 ∵ x = 2
= 2 + 7
= 9
(b) y – 7 ∵ y = 10
= 10 – 7
= 3
(c) 5a ∵ a = 2
= 5X2
= 10
(d) 7a – 3
= (7X1) – 3
= 7 – 3
= 4
(e) 9d
= 9 X 0
= 0
(f) 16 – 4y
= 16 – (4 X 4)
= 16 – 16
= 0
(2) (a) y – 2x
= 25 – (2 X 7)
= 25 – 14
= 11
(b) 3a + 4b
= 3X (-1) + 4 X 2
= – 3 + 8
= 5
(c) 5 (y – x)
= 5 (3.5 – 1.5)
= 5 X 2
= 10
(d) 10x + z – y
= (10X3) + 7 – (-5)
= 30 + 7 + 5
= 42
(3) (a) 4x2
= 4 X (3)2
= 4 X 9
= 36
(b) a2 + 3b
= 22 + 3 X (-1)
= 4 + (-3)
= 4 – 3
= 1
(4) 3a + 5b – 8c – 29
= 3X18 + 5X0 – 8 X (-3) – 29
= 54 + 0 + 24 – 29
= 49