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tamaranim1 [39]
4 years ago
6

How do you solve this? please explain

Mathematics
1 answer:
Serggg [28]4 years ago
7 0
Quick steps to solve this.

1. Lets square both. (X +Y)*2 = 7*7 
2. Then, X*2 + 2XY + Y*2 = 49
3. Since XY is given to 4, X*2 + 8 + Y*2 = 49
4. Move 8
5. X*2 + Y*2 = 49 - 8
6. X*2 + Y*2 = 41

The answer is "41"  Boom!
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What is the value of x?
V125BC [204]

to get the equation of any straight line, we simply need two points off of it, so let's use the points in the picture below.

(\stackrel{x_1}{1}~,~\stackrel{y_1}{5})\qquad (\stackrel{x_2}{3}~,~\stackrel{y_2}{9}) ~\hfill \stackrel{slope}{m}\implies \cfrac{\stackrel{rise} {\stackrel{y_2}{9}-\stackrel{y1}{5}}}{\underset{run} {\underset{x_2}{3}-\underset{x_1}{1}}}\implies \cfrac{4}{2}\implies 2 \\\\\\ \begin{array}{|c|ll} \cline{1-1} \textit{point-slope form}\\ \cline{1-1} \\ y-y_1=m(x-x_1) \\\\ \cline{1-1} \end{array}\implies y-\stackrel{y_1}{5}=\stackrel{m}{2}(x-\stackrel{x_1}{1})

now, if we use the last point from the table, namely (x , 17), we can see that x = x and y = 17, so let's plug those in the equation

(17)-5=2(x-1)\implies 12=2x-2\implies 14=2x\implies \cfrac{14}{2}=x\implies 7=x \\\\[-0.35em] ~\dotfill\\\\ ~\hfill (7~~,~~17)~\hfill

4 0
3 years ago
There are 30 students in Ms. Prema's history class. 18 of these students turned in an extra credit project at the end of the sem
kow [346]

Answer:

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Step-by-step explanation:

3 0
3 years ago
What is the solution to the system of equations below? y=2/5x-3 and x = –10
Andru [333]

The solution to the system of equations y=\frac{2}{5}x-3\,\,and\,\,x=-10 is (-10,-7)

Option 1 is correct.

Step-by-step explanation:

We need to find the solution to the system of equations below.

y=\frac{2}{5}x-3\,\,and\,\,x=-10

The value of x i s x=-10

Putting value of x in first equation we can find value of y

y=\frac{2}{5}x-3\\y=\frac{2}{5}*-10-3\\y=2*-2-3\\y=-4-3\\y=-7

So, value of y is y=-7

The solution to the system of equations y=\frac{2}{5}x-3\,\,and\,\,x=-10 is (-10,-7)

Option 1 is correct.

Keywords: System of equations

Learn more about system of equations at:

  • brainly.com/question/9045597
  • brainly.com/question/3739260
  • brainly.com/question/13168205

#learnwithBrainly

5 0
3 years ago
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Answer:

d

Step-by-step explanation:

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Step-by-step explanation:

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