I found the LCD to be 24
2x * 24 = 48
4x * 24 = 96
15 * 24 = 360?
48 - 360 = -312
96 - 360 = -264
x = 360/360 = 1
X = -216/ 360 = 1.64
x = 2.67
2007-03-11 15:45:19 · 5 answers · asked by DONNA T 3 in Science & Mathematics ➔ Mathematics
2x/3 + 4x/8 = 15
24*2x/3 + 24*4x/8 = 24*15
8*2x + 3*4x = 360
16x + 12x = 360
28x = 360
x = 360/28 = 4*90/(4*7) = 90/7
2007-03-11 15:59:44 · answer #1 · answered by Helmut 7 · 1⤊ 0⤋
2x/3 + 4x/8 = 15 No. 1st simplify fractions where possible
2x/3+x/2=15 now LCD=6
4x/6+3x/6=15 combine like terms
7x/6=15 multiply both sides by 6
7x=90 divide both sides by 7
x=90/7=12.857=12 6/7
2007-03-11 15:56:42 · answer #2 · answered by yupchagee 7 · 1⤊ 0⤋
2x/3 + 4x/8 = 15 (multiply by 24)
16x + 12x = 360
28x = 360
7x = 90
x = 90/7 = 12 6/7 = 12.857...
2007-03-11 15:53:19 · answer #3 · answered by Johnny Handsome 2 · 2⤊ 0⤋
I would first simplify: 2x/3 + x/2 = 15.
Now we have a LCD of 6. Therefore we add the fractions to get 4x/6 + 3x/6 = 15.
Multiply both sides by 6 to get 7x=90.
x=12.857.
If you plug back into the original we get 15.
2007-03-11 15:52:20 · answer #4 · answered by Jeff U 4 · 2⤊ 0⤋
2x/3 + 4x/8 = 15
(2x/3 + x/2 = 15) x 6
4x + 3x = 90
7x = 90
x = 90/7
2007-03-11 15:51:04 · answer #5 · answered by Newbody 4 · 1⤊ 0⤋