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coldgirl [10]
3 years ago
15

What is the slope and y-intercept for -3y + 21x = 15? Ek help...

Mathematics
1 answer:
Paladinen [302]3 years ago
7 0
First, you want to get it looking like y = mx + b, the original formula.
In y = mx + b, m = slope and b = y-intercept.

-3y + 21x = 15
(isolate the y, move the x to the right)
-3y = -21x +15
(isolate the y, divide by -3)
y = 7x - 5

Therefore, the slope is 7 and the y-intercept is -5.
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What is your question?
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valentinak56 [21]
So each of these statements are talking about the square footage of land per person. Let's go and find it!

First off, let's find the number in each building of the original complex:
280 people / 4 buildings

Each building has an equal number of residents. So just divide:
280/4 = 70.

So 70 residents per building

Now consider the fact that once a new building is built, another 70 people will move in.
280 + 70= 350

350 people total.

Then lets look at the plot of land
Originally, there are 200,000 square feet of land for the 4 buildings. Then after the expansion, the plot of land will be:
200,000 + 200*200
= 200,400

Go back to the question. What's the effect of the expansion in terms of square feet of land per person?
Divide!
200,400 / 350
Approximately = 572.57 square feet

Then since it's being compared to the amount each resident had before the expansion, do the same thing with the corresponding numbers:
200,000 / 280
Approximately = 714.29

So how much will each person's land decrease?
714.29 - 572.57 approximately = 141.72 square feet.

The answer is the first choice!

Hope this helps
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3 years ago
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balandron [24]

Answer:

I have solved the question in the picture in two different ways : simplification and factorisation I hope you find it useful bye:)

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