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Contact [7]
3 years ago
14

Solve the following system of equations. In other words, which  values for x and y make both equations true? 

Mathematics
1 answer:
Angelina_Jolie [31]3 years ago
3 0
I'm assuming the two equations are as follows:
y = 5x
7x + 2y = -17

You can substitute 5x for y in the second equation since they are equivalent. Remember that whatever you do to one side you must do to the other as well.
7x + 2y = -17
7x + 2(5x) = -17
7x + 10x = -17
17x = -17
17x /17 = -17 /17
x = -1

Now we sub in the value we have for x to find y:
y = 5x
y = 5(-1)
y = -5

We now check that both answers are right by substituting them both into the second equation:
7x + 2y = -17
7(-1) + 2(-5) = -17
-7 + (-10) = -17
-17 = -17

And it looks like it works! So x = -1, and y = -5. Hope this helps! :)
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Laura drove 638 miles in 11 hours at the same rate how long would it take her to drive 406 miles
shusha [124]

Answer:

Step-by-step explanation:

This is a d = rt problem; but since it is linear, then proportions will work too. Set up the proportion with miles on top and hours on the bottom:

\frac{miles}{hrs}:

Then put the numbers in where they go, keeping in mind that miles goes with miles and hours goes with hours in the ratios, and that our unknown is time (hours):

\frac{miles}{hrs}:\frac{638}{11}=\frac{406}{x} and cross multiply to solve:

638x = 4466 so

x = 7 hrs

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2 years ago
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7nadin3 [17]

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Step-by-step explanation:

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3 years ago
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Sidana [21]
I'm fairly certain the answer is 1/3.
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3 years ago
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What is 0.5 as a fraction
Ulleksa [173]

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8 0
3 years ago
Point Q was rotated by -150° (the center of rotation is indicated). ​
DedPeter [7]

Answer:It’s A

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