2006-07-18 09:07:32 · 10 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
t-7*t/5 = 49
Factor out the "t":
t*(1-7/5) = 49
Do the subtraction:
t*(-2/5) = 49
Divide both sides by -2/5:
t = -49*5/2 = -122.5
2006-07-18 09:12:12 · answer #1 · answered by hfshaw 7 · 0⤊ 0⤋
-7t/5 = 49
-7t = 245
-t = 35
t = -35
The above is assuming, of course, that you said: "Solve for t if -7t/5 = 49". If you actually meant (Solve: t - 7t/5 = 49) then the answer would be -122.5.
2006-07-18 16:26:58 · answer #2 · answered by Anonymous · 0⤊ 0⤋
As I tell my students, the KEY to solving algebra problems is to
Isolate the unknown variable, which is T in this case, by doing the exact opposite of what's being done to it right now.
With -7T / 5 = 49, you're:
1) Dividing T by 5, so the opposite would be to multiply both sides by 5. This would leave you with -7T = 245.
2) Multiplying T by -7, so you'd do the opposite by dividing both sides by -7, which would leave you with T = -35.
2006-07-19 03:34:38 · answer #3 · answered by msoexpert 6 · 0⤊ 0⤋
t - 7t/5 = 49
5t-7t = 49*5
-2t = 245
hence, t = -122.5
2006-07-18 16:19:54 · answer #4 · answered by Anonymous · 0⤊ 0⤋
If by this you mean
t - (7t/5) = 49
multiply everything by 5
5t - 7t = 245
-2t = 245
t = -122.5
but if you mean
(t - 7t)/5 = 49
(-6t)/5 = 49
-6t = 245
t = -40.833
2006-07-18 20:37:39 · answer #5 · answered by Sherman81 6 · 0⤊ 0⤋
Just another approach.
Multiply both sides of the equation by 5
5t - 7t = 245
-2t = 245
t = -245/2 = -122.5
2006-07-18 16:19:51 · answer #6 · answered by kindricko 7 · 0⤊ 0⤋
-7t/5 = 49
-7t = 49 * 5
t = (49*5)/-7
If you do the arithmetic, you have the answer.
2006-07-18 16:11:28 · answer #7 · answered by Esh F 2 · 0⤊ 0⤋
t-7t/5=49
5t-7t= 245
-2t=245
t=-122.5
2006-07-19 10:12:10 · answer #8 · answered by ran685 1 · 0⤊ 0⤋
-35
2006-07-18 16:11:17 · answer #9 · answered by bmcrowell 1 · 0⤊ 0⤋
-122.5
2006-07-18 16:27:20 · answer #10 · answered by Anonymous · 0⤊ 0⤋