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miskamm [114]
2 years ago
15

Workout the value of 5(x-y)

Mathematics
1 answer:
ANTONII [103]2 years ago
6 0

Answer:

5x-5y

Step-by-step explanation:

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Help!! 10 PTS!!
Sliva [168]

Answer:

x = sqrt(433/64) - 7/8 and x = -sqrt(433/64) - 7/8 So there are two.  Let me know if there's something you don't understand.

Step-by-step explanation:

First you want to get them into the form where just y is on one side.

5-y=x^2+x

-y=x^2+x-5

y = -x^2 - x + 5

y+1 = 3/4x

y = 3/4x - 1

Let me know if you don't get how I did that.

To find where they intersect you just set them equal to each other and solve for x.

-x^2 - x + 5 = 3/4x - 1

Before you go solving you are going to want to avoid multiplying and dividing.  Especially dividing here.  if you divide something by (x-a) you make it so a cannot be used.  take 1 for instance.  graphing 1 is just a horizontal line at y=1.  If you divide it by (x-a) in particular lets say (x-1) if you try and solve for x=1 you get 1/0 and you can't divide by 0.  If you graph it on a calculator or computer you'll see the graph doesn't exist at x=1 either.

So yeah, no multiplying or dividing.  So we turn this into a quadratic.

-x^2 - x + 5 = 3/4x - 1

-x + 5 = x^2 + 3/4x - 1

5 = x^2 + 7/4x - 1

0 = x^2 + 7/4x - 6

There are a few ways to solve but I am going to complete the square.  If you don't understand how to solve it let me know and I will more specifically walk through it.

(x + 7/8)^2 - 433/64 = 0

(x + 7/8)^2 = 433/64

x + 7/8 = +/- sqrt(433/64)

x = +/- sqrt(433/64) - 7/8

So there are two answers here.  Positive sqrt(433/64) - 7/8 and negative sqrt(433/64) - 7/8 Or approximately 1.726 and -3.476 respectively.  To check try plugging these into the original two functions y = -x^2 - x + 5 and y = 3/4x-1 and make sure they give the same answer.

Let me know again if there's something you don't get.  When oing intersections though you set the two equations equal to each other and solve for x however you can.

6 0
3 years ago
Write each ratio as a rate
serg [7]
434/7 = 62/1
Hope this helped in any way :)
7 0
3 years ago
Solve the system of linear equations by graphing. Check your solution.
Phantasy [73]
Without the graph the answer is (2,-1)
8 0
2 years ago
Caold someone PLEASE HELP me with number 56
dusya [7]
What's the question?
5 0
3 years ago
Which of the following is the solution set for -3t + 11 > 20?
Lelechka [254]

Answer: C. t < -3

<em>Hope this helps!</em>

7 0
3 years ago
Read 2 more answers
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