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2 years ago

1. Solve for x. 12 10 X 5

Mathematics

1 answer:

Andru [333]2 years ago

3 0

We can use proportions
12/x = 10/5
12*5 = 10x
60 = 10x
x = 6

Check
12/6 = 10/5
2 = 2

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Answer: There were 7 children

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I will solve by substitution.

Solve for y in the first equation

$x+y=25\\x-x+y=25-x\\y=25-x$

Sub in our value for y into the other equation and solve for x

$3x+10y=201\\3x+10(25-x)=201$

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Step 2) Subtract 250 from both sides

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Step 3) Divide both sides by -7

$\frac{-7x}{-7} =\frac{-49}{-7}\\x=7$

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