2007-04-01 02:57:43 · 6 answers · asked by Jose g 1 in Science & Mathematics ➔ Mathematics
Cross multiply - multiply both sides by x, then multiply both sides by x+4
You DO mean
-12/x = -28/(x+4) don't you?
Or do you mean
-12 / x = (-28/x) + 4
In the first instance
-12(x+4) = -28x
-12x - 48 = -28x
28x - 12x - 48 = 0
16x = 48
x = 48/16
x = 3
In the second case
-12 / x = (-28/x) + 4
-12/x = (-28/x) + (4x/x)
-12 = -28 + 4x
4x = 28-12
x = 16/4
x = 4
2007-04-01 03:00:40 · answer #1 · answered by Orinoco 7 · 1⤊ 0⤋
4
2007-04-01 10:04:42 · answer #2 · answered by inquisitive 2 · 0⤊ 0⤋
-12/x = (-28/x) + 4
Multiply all by x
-12 = -28 + 4x
4x = 16
x = 4
2007-04-01 10:01:18 · answer #3 · answered by biglildan 6 · 0⤊ 0⤋
-12/x = -28/x+4
(28/x)-(12/x)=4
16/x=4
4x=16
x=16/4
x=4
2007-04-01 10:08:15 · answer #4 · answered by Anonymous · 0⤊ 0⤋
-12/x = -28/x+4
(-12x -48)/(x^2 + 4x) = (-28x)/(x^2 + 4x)
(-12x -48) = -28x
-48 = -16x
-48/-16 = 3
x = 3
2007-04-01 10:15:02 · answer #5 · answered by oxygengiver2000 2 · 0⤊ 0⤋
-28x = -12x - 48
-40 x = -48
x = 48/40
x = 6/5
2007-04-01 10:01:04 · answer #6 · answered by Anonymous · 0⤊ 0⤋