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expeople1 [14]
2 years ago
14

I need to u substitution method to solve -5x-8y=17 , 2x-7y=-17

Mathematics
1 answer:
harina [27]2 years ago
8 0

Answer:

Alright well solve for the variable in one of the equation's. then substitute the result of the other equation

Point form: - 175/51, 1/51

Equation form:

x = - 175/51          y = 1/51 Hope this help's :)


Step-by-step explanation:


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Diano4ka-milaya [45]

Answer:4

Step-by-step explanation:4

4 0
1 year ago
Solve for x in the equation x squared minus 12 x + 59 = 0. x = negative 12 plus-or-minus StartRoot 85 EndRoot x = negative 6 plu
fgiga [73]

Value of x is: x=6\pm\sqrt{23}i

Option B is correct option.

Step-by-step explanation:

We need to solve the equation x^2-12x+59=0 and find value of x.

Using quadratic formula:

x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}

Putting values of a, b and c and finding the value of x

a=1, b=-12 and c=59

x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}\\x=\frac{-(-12)\pm\sqrt{(-12)^2-4(1)(59)}}{2(1)}\\x=\frac{12\pm\sqrt{144-236}}{2}\\x=\frac{12\pm\sqrt{-92}}{2}\\x=\frac{12\pm\sqrt{92}i}{2}\\We\,\,know\,\sqrt{-1} \,\,is\,\,i\\x=\frac{12\pm2\sqrt{23}i}{2}\\x=\frac{2(6\pm\sqrt{23}i)}{2}\\x=6\pm\sqrt{23}i

So, value of x is: x=6\pm\sqrt{23}i

Option B is correct option.

4 0
2 years ago
Read 2 more answers
A photocopy machine can reduce copies to 80% of their original size. By copying an already reduced copy, further reductions can
alukav5142 [94]

<u>Part a)</u> if a page is reduced to 80%, what percent enlargement is needed to return it to its original size?

Let

x---------> the percent enlargement

we know that

the original size is the 100%

so

x*80%=100%

x=(100%/80%)

x=1.25--------> 1.25=(125/100)=125%

therefore

<u>the answer Part a) is</u>

the percent enlargement is 125%

<u>Part b)</u> Estimate the number of times in succession that a page must be copied to make the final copy less than 15% of the size of the original

we know that

A photocopy machine can reduce copies to 80% of their original size

so

Copy N 1

0.80*100%=80%

Copy N 2

0.80*80%=64%

Copy N 3

0.80*64%=51.2%

Copy N 4

0.80*51.2%=40.96%

Copy N 5

0.80*40.96%=32.77%

Copy N 6

0.80*32.77%=26.21%

Copy N 7

0.80*26.21%=20.97%

Copy N 8

0.80*20.97%=16.78%

Copy N 9

0.80*16.78%=13.42%-------------> 13.42% < 15%

therefore

<u>the answer Part b) is</u>

the number of times in succession is 9


6 0
2 years ago
Robin purchased 3 1⁄2 ounces of whole wheat cereal for $1.40. What is the cost per ounce
Airida [17]
To find cost per ounce divide the total price by the total ounces.
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$ 0.40 per ounce
8 0
2 years ago
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A stadium asked for $760,000 for naming rights. During a bidding war for the stadium naming rights, one company bid 7% more than
alex41 [277]

Answer:

\$\ 829464

Step-by-step explanation:

Bid of first company:

Bid is 7\% more

7\% of 760000=\frac{7}{100}\times760000=53200

Bid of first =760000+53200=813200

Bid of second company:

Bid of second is 2\% greater than that of first

2\% of first bid =\frac{2}{100}\times 813200=16264

Hence Bid of second company =813200+16264=829464

8 0
1 year ago
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