# math

x is partly constant and partly varies as y, when y=2,x=0 and when y=6,x=20.find x when y=3

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1. x = ky + m

2k+m=0
6k+m=20
k=5,m=-10

x = 5y-10

5*3-10 = 5

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posted by Steve
2. 10

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posted by ROSSY
3. I DONT KNOW

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posted by UMAR
4. K=5,M=-10 Wheny=3 x=5

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5. the resistance R to the motion of a car is partly constant and partly varies as the square of the speed V. At 80km per hour the resistance is 1060N and 120km per hour, its resistance is 1460N. What will be the resistance at 140km per hour

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6. I don't know the Answer to that question

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posted by Tessy
7. don't know

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posted by a
8. R = ks^2+m
1060 = (80*80)k+m
6400k+m = 1060 ........(i)

1460 = (120*120)k+m
14400k+m = 1460 .........(ii)

Solve i and ii simultaneously and get k and m.

At 140km/h,
R = (140*140)k+m
Substitute for k and m and get the resistance at 140km/h

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posted by Muhindo
9. I have no idea

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10. Can't really tell

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posted by Anita

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