Question

if 3x + 4y : x + 2y = 9 : 4, then
3x + 5y : 3x - y
is equal to...​

Answer 1

Answer 7:1

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Answer 2

Answer:

7:1

Step-by-step explanation:

by substitution method

3x + 4y : x + 2y = 9

3x + 4y = 9

x + 2y = 4

then, x = 4 - 2y

3 (4-2y) + 4y = 9

12 - 6y + 4y = 9

12 - 2y = 9

-2y = 9 - 12

y = 3/2

now, 3x + 4 (3/2) = 9

(3x + 12) ÷ 2 = 9

3x + 12 = 18

x = 6/3

x = 2

now, put x = 2 and y = 3/2

3x + 5y : 3x - y = 7 : 1