6x+7/ 2x+9= 5/3 thanks
2007-04-12 07:28:18 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
(6x + 7) / (2x + 9) = 5/3
cross multiply
3(6x + 7) = 5(2x + 9)
18x + 21 = 10x + 45
8x + 21 = 45
8x = 24
x = 3
2007-04-12 07:32:41 · answer #1 · answered by Mathematica 7 · 0⤊ 2⤋
proportion Problem
6x + 7 / 2x + 9 = 5 / 3
Cross multiply the means and the extremes
The means = 5(2x + 9)
The extremes = 3(6x + 7)
5(2x + 9) = 3(6x + 7)
10x + 45 = 18x + 21
10x + 45 - 10x = 18x + 21 - 10x
45 = 8x + 21
45 - 21 = 8x + 21 - 21
24 = 8x
24 / 8 = 8x / 8
24 / 8 = x
3 = x
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2007-04-12 15:23:44 · answer #2 · answered by SAMUEL D 7 · 0⤊ 0⤋
6x +7 = 5/3 (2x +9)
6x + 7 = 10/3x + 15
8/3x = 8
8x = 24
x = 3
2007-04-12 14:33:13 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Mulitiply both sides by 2x + 9
6x +7 = 5/3 (2x +9)
6x + 7 = 10/3x + 15 Subtract 10/3x + 7 from both sides
8/3x = 8
8x = 24
x = 3
2007-04-12 14:32:14 · answer #4 · answered by Jeffrey O 3 · 1⤊ 1⤋