15= 3 (7y - 2)
5/8x - 1/2 = 3/4
help please..
2007-09-07 10:21:58 · 7 answers · asked by rose v 2 in Science & Mathematics ➔ Mathematics
15= 3 (7y - 2)
=> 15 = 21y - 6
=> 21 = 21y
=> 1 = y
ANS y=1
5/8x - 1/2 = 3/4
=> 5x - 4 = 6......X by LCM=8
=> 5x = 10
=> x = 2
ANS x=2
QED
2007-09-07 10:24:36 · answer #1 · answered by harry m 6 · 1⤊ 0⤋
15= 3 (7y - 2)
15 =21y-6
21= 21y
1= y
5/8x - 1/2 = 3/4
Multiply by 8 getting
5x -4 =6
5x = 10
x=2
2007-09-07 17:26:23 · answer #2 · answered by ironduke8159 7 · 0⤊ 0⤋
15 = 3 (7y - 2)
15 = 21y - 6
21 = 21y
y = 1
5/(8x) - 1/2 = 3/4
5/(8x) = 3/4 + 1/2
5/(8x) = 3/4 + 2/4
5/(8x) = 5/4
8x = 4
x = 4/8
x = 1/2
2007-09-07 19:06:51 · answer #3 · answered by Kemmy 6 · 0⤊ 0⤋
Multiply 3. 21Y - 6. Add 6 to both sides 21 = 21Y divide by 21. Y = 1. Or divide both sides by 3. 5 = 7y-2. Add 2 to both sides 7= 7 y. divide by 7 1 = y.
2007-09-07 17:31:18 · answer #4 · answered by Big D 1 · 0⤊ 0⤋
3(7x-2) = 15
Invert Operations
(7x-2) = 15/3
(7x-2) = 5
7x = 5+2
7x = 7
x = 7/7 = 1
5/8x - 1/2 = 3/4
Invert Operations
5/8x = 3/4 + 1/2
5/8x = 5/4
x = 5/4 ⢠5/8 = 2
⢠= Divide
2007-09-07 17:32:13 · answer #5 · answered by Anonymous · 0⤊ 0⤋
For the first one, multiply 3 by the contents of the parentheses. Then solve normally.
For the second one, add 1/2 to both sides, then cross-multiply.
2007-09-07 17:24:56 · answer #6 · answered by Brian L 7 · 0⤊ 0⤋
the first is y=1
and the second is x=2
2007-09-07 17:26:32 · answer #7 · answered by L337est 4 · 0⤊ 0⤋