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Anit [1.1K]
2 years ago
5

If y is directly proportional to x and y = 17.5 when x=21 find y when x=39

Mathematics
2 answers:
pychu [463]2 years ago
8 0

21 = 39

—. —

17.5 Y

21y= 682.5

Y=32.5

ANOTHER WAY TO SOLVE IT IS...

Y=kx

17.5=k*21

.833=k

Sooooo

Y=kx

Y=.833*39

Y=32.5

morpeh [17]2 years ago
4 0

direct proportion y=kx , k is constant and k does not equal to 0.

17.5=k(21)

k=5/6

when x =39

y=5/6 ×39

y=32.5

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3 years ago
How many solutions does this system have? y = 3 x minus 5. y = negative x + 4. one two an infinite number no solution
AveGali [126]

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One

Step-by-step explanation:

It is given that,

y = 3x-5 ....(1)

y = -x+4 .....(2)

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Put the value of x in equation (1) we get :

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It means that the value of x is \dfrac{9}{4} and the value of y is \dfrac{7}{4}. Hence, the given equations has only one solution.

6 0
2 years ago
What is the solution to this Equation?
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7 0
1 year ago
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3 years ago
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