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tatyana61 [14]
3 years ago
13

X + 5y - 10 = 0 x = 2y - 8

Mathematics
1 answer:
ipn [44]3 years ago
3 0
So since we know what x is, we can substitute it into the original equation for x like so to solve for y...

(2y - 8) + 5y - 10 = 0
2y - 8 + 5y = 10
2y + 5y = 18
7y = 18
y = 18/7 (or about 2.57)

So now we know what x is, we can sub it into the below equation to solve for x...

x = 2(18/7) - 8
x = 36/14 - 8 (or about -5.43)


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Jose drove 380 miles using 14 gallons of gas. At this rate, how many gallons of gas would he need to drive 418 miles?
PSYCHO15rus [73]
Hey there,
380 miles = 14 gallons
1 miles = 14 / 380
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418 miles = 7 / 190 x 418
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Hope this helps :))

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3 years ago
I NEED HELP NOW ITS WORTH 100 POINTS ITS A STUPID QUESTION BUT I NEED TO UNDERSTAND THIS ASAPP MY TEACHER ISNT HELPING AT ALL
sergiy2304 [10]

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8 0
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aleksandrvk [35]

Answer:

a) 4.4583 b) Fiona

Step-by-step explanation:

First find the average of the numbers by adding them all together then dividing them by the amount of numbers given:

(85 + 88 + 90 + 91 + 93 + 96 + 97 + 97 + 98 + 98 + 99 + 105)\div12= 1137\div12= 94.75

Then find the difference between each number and the answer you got

(85 - 94.75) + (88 - 94.75) + (90 - 94.75) + (91 - 94.75) + (93 - 94.75) + (96 - 94.75) + (97 - 94.75) + (97 - 94.75) + (98 - 94.75) + (98 - 94.75) + (99 - 94.75) + (105 - 94.75)\div12

Which is

(9.75) + (6.75) + (4.75) + (3.75) + (1.75) + (1.25) + (2.25) + (2.25) + (3.25) + (3.25) + (4.25) + (10.25)\div12

Which comes out to

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6 0
3 years ago
Factorise the following expression :​
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Answer:

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Step-by-step explanation:

(i)

3ax - 6xy + 8by - 4ab

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= 3x (a - 2y) - 4b (a - 2y)

= (a - 2y) (3x - 4b)

(iii)

{m}^{2}  - mn + 4m - 4n \\  \\  = m(m - n) + 4(m - n) \\  \\  = (m - n)(m + 4)

4 0
3 years ago
Is phi coefficient only determined by the proportion in a 2x2 data matrix?
BaLLatris [955]
Yes is your answer. hope this helps!
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3 years ago
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