Math

Find the value of y for a given value of x, if y varies directly with x.

If y = –252 when x = 84, what is y when x = 74?

  1. 👍
  2. 👎
  3. 👁
  1. y = kx
    -252 = k(84)
    k = -3

    y(74) = -3(74) = -222

    1. 👍
    2. 👎
  2. Do the same thing with X 6, 18, 54, 162
    Y 24, 72, 216, 640

    2.52 = k(8.4)
    K=0.03
    Y(2.7)=0.03(2.7)=0.81

    1. 👍
    2. 👎
  3. f(x)=4x+7,find f(4)

    1. 👍
    2. 👎
  4. Find the value of x when y=24

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. math

    p varies directly as q and the square of r and inversely as s write the equation of the relation find k if p=40 q=5 r=4 s=6 find p when q=8 r=6 and s=9 find s when p=10 q=5 r=2

  2. 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

  3. Please Help!! Math

    If c varies directly as the square root of d, and c = 14 when d = 64, find c when d = 324.

  4. 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

  1. 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

  2. math

    P varies directly as the square root of q. P=8 when q =25 find p when q = 100

  3. Mathematics

    M varies directly as n and inversely as p. if M=3, when n=2,and p=1, find M in terms of n and p

  4. Algebra II

    if y varies directly as x, if y=80 when x=32, find x if y=100

  1. Math

    Y varies directly as the square of x and y=96 when x=4 find the value of y when x=5

  2. algebra

    I do not know where to start with this one. Suppose p varies directly as the square of z and inversely as r. If p = 32/5 when z = 4 and r = 10, find p when z = 3 and r = 36.

  3. Math help

    9). Hooke’s Law. The distance d when a spring is stretched by a hanging object varies directly as the weight w of the object. If the distance is 29 cm when the weight is 4 kg what is the distance when the weight is 9 kg? 10).

  4. Math

    M varies directly as the square of N. If N increases by 10%, find the percentage change in M

You can view more similar questions or ask a new question.