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Art [367]
3 years ago
15

X and y is the variable 4x-7y=3 x-7y=-15 what is the answer please

Mathematics
1 answer:
andrezito [222]3 years ago
6 0
Use linear combination to solve this. It is much faster than substitution. I would start by multiplying the bottom equation by -1.
<span>4x-7y=3
-x+7y=15</span>
Then, add the two equations together. The result is:
3x=18.
You've eliminated one variable. Now you can solve for the other one.
Divide both sides by 3 to get
x=6
Plug this into one of the original equations, then solve for y
-(6)+7y=15
7y=21
y=3

Check your work by plugging these values into both equations to see if they remain true

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Olenka [21]
The GCF of 14 and 35 is 7.
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3 years ago
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What is x when the equation is 5|2x+3|=45?
storchak [24]
1.)divide by 5 on each side to obtain
Abs(2x+3)=45
2x+3=45 or 2x+3=-45
2x=42 or 2x=-48
x=21 or x=-24
6 0
3 years ago
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Just help, what are the answer, Its due in 15 minutes and yea, ill mark brainliest and dont give me a link saying the answer is
Naddik [55]

Answer:

<h2><u><em>6. </em></u></h2><h2><u><em>   a. 11 and 2/3 yds. squared</em></u></h2><h2 /><h2><u><em>   b. Yes, the volume of the shed is 11 and 1/3 yards squared and what she's trying to put into it is only 10 yards squared, if put in properly, it will be able to fit.</em></u></h2><h2 /><h2><u><em>7. 1,110 in. squared</em></u></h2>

Step-by-step explanation:

6.

a.

(10/3)*(14/9)*(9/4)

= 11 2/3

b.

Yes, because the volume of the shed is about 11.67 yards long, the 10 yards of wood will fit in the shed.

7.

For this one, we have to break it into two pieces.

(I made them into a small box and and big box)

The measurements of the small box are 7*5*6.

The measurements of the big box are 20*5*9.

Using this information, we can make the following equation and solve it quickly.

(7*5*6) + (20*5*9)

(210) + (900)

1,110

Thus, the volume of this box is 1,110 in. ^2

7 0
3 years ago
I NEED HELP REALLY FAST PLEASE! Find the measure of the missing angles.
nikdorinn [45]

Step-by-step explanation:

x+47=90

x=43

----------------

y+x=90

put in 43 for x

y+43=90

y=47

Hope that helps :)

7 0
3 years ago
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A cafe is open for six days a week. There was a mean number of 86 customers for five days. On the next day there were 122 custom
ElenaW [278]

Answer:

92

Step-by-step explanation:

The mean is calculated as

mean = \frac{sum}{count}

The sum of customers over the 5 days is

\frac{sum}{5} = 86 ( multiply both sides by 5 )

sum = 430

Thus mean over the 6 days is

mean = \frac{430+122}{6} = \frac{552}{6} = 92

4 0
3 years ago
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