2007-03-01 02:32:09 · 6 answers · asked by engineerlog 2 in Science & Mathematics ➔ Mathematics
If your equation is (21/15) - 3x < 0,
-3x < (-21/15)
x > 7/15
If your equation is 21/(15-3x) < 0, the expression on the left hand side will only be negative (less than zero) if the denominator is negative, which results in
15 - 3x < 0
-3x < -15
x > 5
Choose the solution that corresponds to whichever equation you meant. And remember, parentheses help a lot!
2007-03-01 02:35:39 · answer #1 · answered by MamaMia © 7 · 1⤊ 0⤋
If you meant 21/(15 - 3x) < 0, and I suspect that you did, then the situation is different. The left hand side is a fraction which we want to be negative. What does this mean about the signs of the top and bottom of the fraction? This should lead you to a simpler inequality which ends with x < integer or x > integer but I'm not going to tell you which. If you get that right, I would think that you could write it as an interval.
2007-03-01 02:46:44 · answer #2 · answered by Anonymous · 0⤊ 0⤋
you have
21/15 <3x divide by 3
7/15
7< 15x
7/15
x> 15/7
2007-03-01 02:39:59 · answer #3 · answered by maussy 7 · 0⤊ 1⤋
21/15 < 3x
7/15 < x
2007-03-01 02:37:42 · answer #4 · answered by SS4 7 · 0⤊ 0⤋
21 / 15 - 3x < 0
7 / 15 - x < 0
7 / 15 < x
x > -7/15
(-7 / 15, inf)
2007-03-01 02:37:37 · answer #5 · answered by Phred 3 · 0⤊ 1⤋
21 / 15 = 1.4 (or 7/5)
2007-03-01 02:36:51 · answer #6 · answered by Anonymous · 0⤊ 1⤋