7(x - 3) > 5x - 14
7x-21>5x-14
+21> -21 ----l---------•----------
7x >5x 7 0 7/2
-5x >-5
2007-04-12 08:35:17 · 8 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
I'm not sure what your 3rd and 4th lines say, but I'm gonna go ahead and asolve this and maybe that'll help
distribute to get
7x-21 > 5x - 14
add 21 to both sides
7x > 5x + 7
subtract 5x
2x > 7
divide by two
x > 7/2 or 3.5
2007-04-12 08:43:06 · answer #1 · answered by c_eckdhal71487 2 · 0⤊ 0⤋
I don't know what went wrong on line 3 of the working, but:
7x - 21 > 5x - 14
7x - 5x > 21 - 14
(7 - 5)x > 7
2x > 7
x > 7/2
2007-04-12 15:42:31 · answer #2 · answered by Anonymous · 0⤊ 0⤋
7(x - 3) > 5x - 14
7x - 21 > 5x - 14
7x - 5x > -14 + 21
2x > 7
x > 7/2
Solution: {x belongs to R| x > 7/2}
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2007-04-12 16:19:38 · answer #3 · answered by aeiou 7 · 0⤊ 0⤋
7(x - 3) > 5x -14
7x - 21 > 5x - 14
7x - 5x > 21 - 14
2x > 7
x > 7/2
x > 3.5
That's the solution
2007-04-12 15:48:08 · answer #4 · answered by TBU 2 · 0⤊ 0⤋
Hmm.. I don't know how you got +21 > -21 ?!?!? Is it necessary?
Here's what I will do:
7x - 21 > 5x - 14
=> 7x - 5x > 21 - 14
=> 2x > 7
=> x > 7/2
Hope this helps! Good Luck!
2007-04-12 15:44:45 · answer #5 · answered by A.Samad Shaikh 2 · 0⤊ 0⤋
7(x - 3) > 5x - 14
7x - 21 > 5x - 14
7x - 21 - 5x = 5x - 14 - 5x
2x - 21 = - 14
2x - 21 + 21 = - 14 + 21
2x = 7
2x / 2 = 7 / 2
x = 7 / 2
x = 3 1/2
x - 3.5
- - - - - - - - - -s-
2007-04-12 16:03:49 · answer #6 · answered by SAMUEL D 7 · 0⤊ 0⤋
7(x - 3) > 5x - 14
7(x) - 7(3) > 5x - 14
7x - 21 > 5x - 14
2x - 21 > -14
2x > 7
x > 3.5
2007-04-12 15:41:28 · answer #7 · answered by Anonymous · 1⤊ 0⤋
holy crap this is way different from the math i do
2007-04-12 16:32:03 · answer #8 · answered by Anonymous · 0⤊ 0⤋