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natta225 [31]
3 years ago
13

Fill in the other coordinate for the line 7x - 5y =21:(4 , ?)

Mathematics
2 answers:
LekaFEV [45]3 years ago
3 0
7x-5y=21 when x=4 from the coordinate point of (4,y)
Next,
7x-5y=21
Substitute x with 4
7(4)-5y=21
28-5y=21
Add 5 to each side
28-5y+5y=21+5y
28=21+5y
Subtract 21 to each side
28-21=21+5y-21
7=5y
Divided 5 to each side
7/5=5y/5
y=7/5
Or
y=1 2/5
Check:
7x-5y=21
Substitute x with 4 and y with 7/5
7(4)-5(7/5)=21
28-7=21
21=21. As a result, (4,7/5) is your correct answer. Hope it help!
Viefleur [7K]3 years ago
3 0
If you know that x is 4, (assuming it's placed as x,y) then simply substitute 7(4)-5y=21.
28 - 5y =21.
28 - 21 =5y
5y= 5
Y= 1
Not sure if I'm right but I think that's how it's done the simple way.
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8 0
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When principal = Rs x, Time = y years and Rate = z% per year, calculate the simple interest.
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3 0
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Which of these points lies on the circle with center (2 3) and radius 2
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4 0
3 years ago
7. The bottom of a circular swimming pool
mote1985 [20]
<h2>Hello!</h2>

The answer is:

1017.88 square feet are blue.

<h2>Why?</h2>

To calculate how many square feet are blue, we need to calculate the area of the bottom of the circular swimming pool.

We need to remember that we can calculate the area of any circle using the following formula:

Area_{circle}=\pi radius^{2}

Now, we know that the diameter of the bottom is equal to 36 feet, so, we can calculate the radius of the bottom using the following formula:

diameter=2radius\\\\radius=\frac{diameter}{2}

So,

radius=\frac{36feet}{2}=18feet

Then, calculating the area we have:

Area_{bottom}=\pi radius^{2}=\pi 18ft^{2}=1017.88ft^{2}

Hence, we have that 1017.88 square feet are blue.

Have a nice day!

4 0
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Find two numbers whose sum is 15; twice the first number decreased by the second number gives 6.
Olegator [25]

7 + 8 = 15
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Hope this helps!

4 0
3 years ago
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