8. If 4X + 3Y / 4X-3Y = 43/13, then X
TY=? *
5/7
O
7/5
6/5
O
5/6
9. a3 + 10 b3/a 3-10 b3 = 205/45,
2*
Answers
Answered by
5
Answer:
(ii) (4x + 3y) : (3x + 5y) = 6:7
Given, y = 10
(4x + 3 x 10) : (3x + 5 x 10) = 6 : 7
(4x + 30) : (3x + 50) = 6 : 7
7 x (4x + 30) = 6 x (3x + 50)
28x + 210 + 18x + 300
28x - 18x + 300 - 210
10x = 90
\Rightarrow x=\frac{90}{10}=9⇒x=
10
90
=9
(iii) (4x + 3y) : (3x + 5y) = 6 : 7
Given, x= 27
(4 x 27 + 3y) : (3 x 27 + 5y) = 6 : 7
(108 + 3y) : (81 + 5y) = 6 : 7
7 x (108 + 3y) = 6 x (81 + 5y)
756 + 21y = 486 + 30y
9y = 270
\Rightarrow\ y=\frac{270}{9}=30⇒ y=
9
270
=30
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