# Pre-Algebra

If y varies directly with x, find the constant of variation with x = 4 and y = -24

If y varies inversely with x, find the constant of variation with x=5 and y = 10

If y varies directly with x, and y = 35 when x = 5 , find x when y = -7

If y varies directly with x, and y = -12 when x = 6, find x when y = -4

If y varies inversely with x, and y = 8 when x = 10 , find x when y = 4

If y varies inversely with x, and y = -5 when x = 20, find x when y = -4

I need the answer to these very, very, badlyyyyy!!!

There were 6 rows of these I completed the first rows, this a row, and I'm currently working on the last row.

1. 👍
2. 👎
3. 👁
1. direct: y = kx, so k = y/x
inverse: xy = k

If y varies directly with x, find the constant of variation with x = 4 and y = -24
k = y/x = -24/4 = -6

If y varies inversely with x, find the constant of variation with x=5 and y = 10
k = xy = 5*10 = 50

and do the others in like wise.

1. 👍
2. 👎
2. PL?o<l

1. 👍
2. 👎

## Similar Questions

1. ### Algebra worksheet

Hello. My algebra teacher gave me this worksheet last week and everyone had to bring it yesterday and I haven't done it yet. Can someone please help me. He said Friday is the last day or he's going to take away some points. I've

2. ### variation

Can you please check my answers? Thanxs! Write an equation that expresses the relationship. Use k as the constant of variation. 20. f varies jointly as b and the square of c. -I got: f=kbc^2 22. r varies jointly as the square of s

3. ### Math

Write an equation to describe the variation. Use k for the constant of proportionality. x varies directly as the square of y and inversely as z

4. ### algebra

find the variation constant and an equation of variation where y varies directly as x and y=35 when x=5 the variation constant is k=

1. ### algebra

1.) suppose y varies directly as x.if x=24 when y=8 then what is the constant of variation? 2.) suppose y varies inversely as x if x=4 when y=8 then what is the constant of variation?

2. ### math

the acceleration of an object varies directly as the force f exerted and inversely as its mass m. if the constant of variation is 1 find the acceleration in meters/second^ of a 10 kg object exerting force of 10 newtons

3. ### algebra

Find the variation constaant and an equation of variation where Y varies directly as X and Y = 72 hen X = 8 The variation constant is K = ? The equation of variation is Y = ? I think that K = 9 but not sure I don't have a clue

4. ### algebra

Determine whether y varies directly with x, If so, find the constant of variation k and write the equation. x y 4 6.4 7 11.2 10 16 13 20.8 Would like for someone to explain if possible

1. ### math

t varies directly as the square root of l. If l=81, then t=10 what is the constant proportion? 1. a is directly proportional to b. If a = 15, then b = 9 2. M varies directly as n. If n = 2/3, then m = 1/4 3. T varies as the square

2. ### PRE-CALC still stuck

Write the statement as a power function equation. Use k for constant of variation if one is not given. a. Charles's law states the volume V of an enclosed ideal gas at a constant pressure varies directly as the absolute

3. ### Algebra

Suppose that Y varies directly with X, and Y=4 when X=16 (a) Write a direct variation equation that relates X and Y (b) Find Y when X=3

4. ### Math

DIRECT VARIATION 1. a is directly proportional to b.If a=15,then b=9 2. m varies directly as n.If n=2/3,then m=1/4 3. T varies as the square root of L. If L=81,then T=10 4.r varies directly as the square of t. If t=16,then r=6. 5.