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Answers
Answer:
a) 8x - 21 = 5x + 9
by shifting , we get
8x-5x = 9+21
3x = 30
x = 30/3
x=3
b) 27/x = 81/18
by crossing , we get
27×18 = 81x
486 = 81 x
486/81 = x
x = 6
c) 3d-9d+4d =32
by BODMAS RULE , we get
7d-9d = 32
-2d = 32
d = -32/2
d = -16
Answer:
a) 8x-21= 5x+9
Step-by-step explanation:
= 8x-21=5x+9.
= 8x-5x=9+21
= 3x = 30
= x = 30/3
= x = 10
verification:
since x =10 ,we multiply 10 with the number in place of x.
=8×10 - 21 = 5×10+9
=80-21 = 50+9
=59 = 59
Hence, LHS=RHS.verified.
b) 27/X = 81/18
= 27/X = 81/18
= 27×18 = 81×X (by cross multiplication)
= 486 = 81X
= X = 486/81
= X = 6
verification:
since X=6 ,we multiply 6 with the number in place of x.
= 27/6 = 81/18
= 9/2 = 9/2
Hence, LHS=RHS. verified.
c) 3d-4d+9d = 32
= 3d-4d+9d = 32
= 3d+5d = 32
= 8d. = 32
= d = 32/8
= d = 4
verification:
since d=4, we multiply 4 with the number in place of d to get LHS=RHS.
= 3d-4d+9d = 32
= 3×4-4×4+9×4 = 32
= 12-16+36 = 32
= 36+12-16 = 32
= 48-16 = 32
= 32 = 32
Hence, LHS =RHS. verified.