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lakkis [162]
3 years ago
14

One number is seven more than twice another . If their sum is decreased my ten the result is twelve. Find the numbers

Mathematics
1 answer:
Rainbow [258]3 years ago
3 0

Answer:

5, 17

Step-by-step explanation:

For this problem, you need to create a system of equations.

We can name one number x and the other y.

First equation: 2x + 7 = y

Second equation: x + y - 10 = 12, or x + y = 22.

We know y = 2x + 7, so we can substitute that into the second equation.

x + 2x + 7 = 22.

3x = 15

x = 5.

Plug x back into the first equation:

2 · 5 + 7 = y.

y = 10 + 7

y = 17.

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Answer:

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Step-by-step explanation:

<em>Since the ratio of blue jays to robin's was 6 to 7 then if there were 84 robins how many blue jays were there.</em>

<em>6 to 7 can also be express as 6/7</em>

<em>Thus, we can set up a proportion</em>

<em>6/7 = x/84</em>

<em>Now, we have to solve for x</em>

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<em>Hence, if there were 84 robin there would be 72 blue jays.</em>

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2 years ago
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3 years ago
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Step-by-step explanation:

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