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3 years ago

x is partly constant and partly varies with y. When y=3, x = 7 and when y = 6, x = 9. Find x when y = 4

Mathematics

1 answer:

hoa [83]3 years ago

4 0

Answer:

x=23/3

Step-by-step explanation:

x=c+ay

7=c+3a | *(-1)

9=c+6a

-7=-c-3a

9=c+6a

------------

9-7=c-c+6a-3a

2=3a

a=2/3

7=c+3*2/3

7=c+2

-2 -2

5=c

so x=5+2/3*y

when y=4 then x=5+2/3*4=5+8/3

x=15/3+8/3

x=23/3

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2 years ago

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Read 2 more answers

Question 3 of 8. Step 1 of 1

natali 33 [55]

308 gallons of 7% and 77 gallons of 2% are needed to obtain the desired 385 gallons.

<h3><u>Combination</u></h3>

Since a dairy needs 385 gallons of milk containing 6% butterfat, to determine how many gallons each of milk containing 7% butterfat and milk containing 2% butterfat must be used to obtain the desired 385 gallons, the following calculation must be performed:

385 x 0.06 = 23.1
300 x 0.07 + 85 x 0.02 = 22.7
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Therefore, 308 gallons of 7% and 77 gallons of 2% are needed to obtain the desired 385 gallons.

Learn more about combination in brainly.com/question/27339616

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