2 years ago

If 3x = 7y, what are the following ratios? 3y:x

Mathematics

1 answer:

Orlov [11]2 years ago

8 0

for

: To do this we must divide each side of the equation by

which will give us

while keeping the equation balance.

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Math Activity #2 The number of the day is 178.25 • Write this number in word form:

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Answer:

one hundred seventy eight point two five.

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Given g(x) = -x + 5, solve for x when g(x) = 3.

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Both equal g(x) so put them together

-x+5=3 then solve for x

-x=3-5
-x=-2
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Step-by-step explanation:

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Riley and Erik have earned a total of 135 tokens to buy items in the school store. The ratio of the number of tokens that Riley

lisabon 2012 [21]

Answer:

Riley has 72 tokens

Step-by-step explanation:

System of Equations

We have two conditions for the tokens Riley and Erik have earned. Let's call x and y to the number of tokens of Riley and Erik respectively. The first condition states that

$x+y=135$

Solving for y

$y=135-x$

The second condition is that the ratio of the number of tokens that Riley had to the number of tokens that Erik has is 8 to 7. It's written as

$\displaystyle \frac{x}{y}=\frac{8}{7}$

Or equivalently

$7x=8y$

Replacing y from the first equation

$7x=8(135-x)$

Operating

$7x=1080-8x$

Simplifying

$15x=1080$

$\boxed{x=72}$

Riley has 72 tokens

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Allen is buying a video game that originally costs $49. He has a 10%-off

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