SOLUTION: please help me solve the following equations: 1. -1 = -4/7t 2. -3/8w = -9 3. -3/15s = 4 4. -3x = 3/2

Algebra ->  Equations -> SOLUTION: please help me solve the following equations: 1. -1 = -4/7t 2. -3/8w = -9 3. -3/15s = 4 4. -3x = 3/2       Log On


   

Question 116204: please help me solve the following equations:
1. -1 = -4/7t
2. -3/8w = -9
3. -3/15s = 4
4. -3x = 3/2

Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
I'll do the first two to get you started:

#1



-1=%28-4%2F7%29t Start with the given equation



%287%29%28-1%29=%287%29%28%28-4%2F7%29t%29 Multiply both sides by 7.

-7=-4t Multiply



0=-4t%2B7Add 7 to both sides


%2B4t=%2B7 Add 4t to both sides


t=%287%29%2F%284%29 Divide both sides by 4 to isolate t


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Answer:
So our answer is t=7%2F4 (which is approximately t=1.75 in decimal form)



#2



%28-3%2F8%29w=-9 Start with the given equation



%288%29%28%28-3%2F8%29w%29=%288%29%28-9%29 Multiply both sides by 8.

-3w=-72 Multiply



w=%28-72%29%2F%28-3%29 Divide both sides by -3 to isolate w



w=24 Divide

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Answer:
So our answer is w=24