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xz_007 [3.2K]
3 years ago
12

Please solve with elimination

Mathematics
1 answer:
pshichka [43]3 years ago
6 0

Answer:

Step-by-step explanation:

5x+9y=-3             Multiply both sides by 8

40x+72y=-24

-53x-8y=-3  Multiply both sides by 9

-477x -72y= -27

sum the equations vertically to eliminate one variable  

40x+72y= -24

-477x-72y= -27       (the y cancels out )

-477x =-51                (-24 + -27=-51)

-477x=-51 / -477       divide both sides by -477

x =51/437

5x 51/437=9y= -3   substitute the value of x

y= -174 /437

(x,y) = (51/437,  -174/437)

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How do fraction tiles help me subtract unlike fractions?
Leokris [45]

Answer:

Step-by-step explanation:

They let you see how one fraction compares to another for one.  Say you had 2/5 and 3/7 it may be tricky to tell which is bigger, but having the tiles will let you see that 3/7 is slightly bigger.  And there are many many more complicated  examples.  So if you know which is bigger you will know subtracting the smaller one will keep it positive, while if you subtract the larger from the smaller one it will be negative.

Also, you can then find equivalent tiles.  In the example I gave you would be able to see 2/5 = 14/35 and 3/7 = 15/35.  Which are like fractions you can subtract simply.  

3 0
3 years ago
Rationalize <br><img src="https://tex.z-dn.net/?f=%20%5Cfrac%7B1%7D%7B2%20%5Csqrt%7B7%7D%20%2B%203%20%5Csqrt%7B3%7D%20%20%7D%20"
Ivahew [28]
\dfrac{1}{2 \sqrt{7} + 3 \sqrt{3}  }

= \dfrac{1}{2 \sqrt{7} + 3 \sqrt{3} } \times  \dfrac{2 \sqrt{7} - 3 \sqrt{3}}{2 \sqrt{7} - 3 \sqrt{3}}

=\dfrac{2 \sqrt{7} - 3 \sqrt{3}}{(2\sqrt{7})^2 - (3\sqrt{3})^2}

=\dfrac{2 \sqrt{7} - 3 \sqrt{3}}{28 - 27}

=\dfrac{2 \sqrt{7} - 3 \sqrt{3}}{1}

=2 \sqrt{7} - 3 \sqrt{3}

6 0
3 years ago
What is the equation of the line that has a slope of -4/5 and a y-intercept of -1/6
baherus [9]

To make an equation of a line, you must put it in Y=mx +b form.

m = slope and b = y-intercept

Now just plug in

Answer is Y= -4/5x - 1/6

3 0
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Two boxes of apples contain a total of 24 apples. If you have large number of apples in the first box and add 4 apples to the se
Ivahew [28]
Answer.
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3 years ago
Suppose a normal distribution has a mean of 38 and a standard deviation of
lawyer [7]
C is the right answer
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