Math
posted by Thanakorn .
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

Math 
bobpursley
w=kx+c
9=k4+c
27=k*16+c
subtract eq 1 from eq 2
18=12k solve for k
then solve for c in either equation
Respond to this Question
Similar Questions

maths
y is partly constant and partly varies as the cube of x given that whenx=1,y=5,andx=2,y=1 find the relationship betweenx and y hence find the value of y when x=3 
maths
y is partly constant and partly varies as the cube of x given that whenx=1,y=5,andx=2,y=1 find the relationship betweenx and y hence find the value of y when x=3 
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 
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 … 
math
X is partly constant and partly varies as y. When y is 5,x is 7 and when y is 7 x is 8. Find the law of the variation and find x when y is 11 
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 
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 
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 
Math
A quantity p is partly constant and partly varies inversely as a quantity q,given that p=10 when q is 1.5 and p=20 when q=1.25 find the value of p when q =0.5 
Math
R is partly constant and partly varies with E when R=530,E=16000 and when R=730,E=3600. i)find the formula which connects R&E i)find R when E=1300.