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3 years ago

10

1/a+1/b=c solve for b

1 answer:

Mrac [35]3 years ago

8 0

Multiply it all by ab/1

b + a = abc

subtract a on both sides and subtract abc on both sides

b - abc = -a

divide by -ac on both sides

b = -a/-ac

b = c

I hope that helps

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Solve −5x = 15. (1 point)<br><br><br> −3<br> 3<br> 10<br> 20

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Remember you can do anything to an eqautoin as long as you do oit to both sides

-5x=15
try to get 1x by itself

remember
(ax)/a=x when a=a

so
-5x=15
get x
divide both sides by -5
remember to flip sign
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answer is first one
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_______________________________________________

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$I_2 = P_2r_2t$

Where

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Then we multiply the second equation by -0.07 and add it to the first equation:

$0.07P_1 + 0.05P_2 = 1.280\\.\ \ \ \ \ \ \ \ +\\-0.07P_1 -0.07P_2 = -1400\\-------------$

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