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mars1129 [50]
2 years ago
6

Assume that y varies directly as x then solve. If x = 12 when y = 15 find x when y = 21.

Mathematics
2 answers:
Viefleur [7K]2 years ago
7 0

Answer:

18

Step-by-step explanation:

12 and 15 are both dividable by 3 and 3 apart so if you subtract 21 by 3 than you get 18

SVETLANKA909090 [29]2 years ago
5 0

Answer:

18 or 16.8

Step-by-step explanation:

if x=12 and y=15, this can be written as y=x+3 or y=1.25x

so  your equation becomes x+3=21 or 1.25x=21

subtract 3 from both sides, or divide by 1.25

and you get x=18 or x=16.8

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Y/a −b= y/b −a, if a≠b<br><br> solve for y
Kamila [148]

Answer:

y= ab    if a≠b

Step-by-step explanation:

y/a −b= y/b −a

multiply each side by ab to clear the fractions

ab(y/a −b) = ab( y/b −a)

distribute

ab * y/a - ab*b = ab * y/b - ab *a

b*y - ab^2 = ay -a^2 b

subtract ay on each side

by -ay -ab^2 = ay-ay -a^2b

by -ay -ab^2 =-a^2b

add ab^2 to each side

by-ay -ab^2 +ab^2 = ab^2 - a^2b

by-ay = ab^2 - a^2b

factor out the y on the left, factor out an ab on the right

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divide by (b-a)

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y = ab

5 0
3 years ago
Add the expressions four -2/3 B +1/4 a and 1/2 a+1/6b-7. What is the simplified some?
anzhelika [568]

Answer:

I tried the question and I got. a/4-b/2-5/2

Step-by-step explanation:

I hope this helps

3 0
3 years ago
What is the volume of a square prism that is 4 centimeters by 4 centimeters by 8 centimeters
My name is Ann [436]

Answer:

138 is the answer

Step-by-step explanation:

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6 0
3 years ago
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Blizzard [7]

Answer:

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Step-by-step explanation:

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3 years ago
How do I do this? I’m so confused
Shtirlitz [24]

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