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mote1985 [20]
3 years ago
15

The difference between a number and four is multiplied by negative five. The result is twenty. What is the number?

Mathematics
2 answers:
spayn [35]3 years ago
4 0
(n-4)*-5=20           Answer is  n= 8
natima [27]3 years ago
3 0
-5(n - 4) = 20

Distribute the -5 through the parenthesis
-5n + 20 = 20

subtract 20 from both sides
-5n = 0

Divide both sides by -5
n = 0

CHECK
-5( 0 - 4) =
-5(-4) = 20
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A and b are positive integers. Find <img src="https://tex.z-dn.net/?f=-2a%2B3b" id="TexFormula1" title="-2a+3b" alt="-2a+3b" ali
lord [1]

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From what I know you can't really solve a a single equation with two-variables so it's just a matter of trial and error.

Just try plugging in a small number like 2 for a just to try it and you get 8b^2=72.

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Now that we know that a=2 and b=3 just plug them into the equation.

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