Maths

y=is partly constant and partly varies e.g x=a and when=5,y=8,when x=6y=4
A.find the value of y when x=15
B.find x when y =20

  1. 👍 0
  2. 👎 0
  3. 👁 49
  1. y = a + bx
    so,
    a + 5b = 8
    a + 6b = 4
    Solving these, we get b = -4, a = 28
    y = 28 - 4x
    Now you can answer the questions.

Respond to this Question

First Name

Your Response

Similar Questions

  1. Math

    Y varies partly as x, partly inversely as x and partly constant. The graph of y against x passes through the points (2,20), (3,16), and (5,14). Find a general formula for y in terms of x My proposed formula is y = x / kx

    asked by Johannes on December 6, 2016
  2. Math

    The resistance of the motionof a vechincle is partly constant and partly constant and partly varies to the square of its speed.At 30km/h the resistance is 496, and at 50km/h is 656N.Find the resistance at 60km/h

    asked by Adekunle Adebola on October 9, 2018
  3. mathematics

    x is partly constant and partly varies as y^2 when y =11,x=52.8and when y = 5 and x = 8 find (a) equation connecting x and y (b) y when x = 105.6

    asked by Ahmad on February 20, 2018
  4. Math

    If w is partly constant and partly varies directly as x and w=9 when x=4 w=27 when x= 16 find An equation connection x and w And (b) the value of w when x =8

    asked by Thanakorn on February 14, 2018
  5. math

    A quantity T is partly constant and partly varies as the square root of s. a) Using constant a and b, write down an equation connecting T and S. b) If S = 16, and when T = 24 and S = 36 when T = 32, find the value of the constants

    asked by kudu on February 9, 2015
  6. variation

    x is partly constant and partly varies as y when y=5, x=7,and y=7,x=8.find the law of variation and also x, when y=11

    asked by agbaje yusuf on January 25, 2014
  7. mathematics

    x is partly constant and partly varies as y .when y=5,x =7;and when y=7 x=8.find the law of variation and also x when y=11

    asked by beatrice on April 20, 2017
  8. maths

    P is partly constant and partly varies inversely as Q.lf Q=9 when P=3 and Q=18 when P=9 find P when Q=12

    asked by anwari on April 21, 2016
  9. Math

    Y is partly constant and partly varies as x. When x=2,y=16 and when x=7,y=31,find y in terms of x.

    asked by Tessy on November 22, 2018
  10. Maths

    Y is partly constant and partly varies as x...if y=2 x=4 and when y=5 x=8....find y when x=9

    asked by Edward on August 23, 2018
  11. Math

    M partly varies as N and is partly constant. When M=2,N=3,when M=4,N=2.find M when N=1

    asked by Fatiah on October 14, 2018

More Similar Questions