formulae

Question 1

direct linear proportion equation

Answer 1

y=kx or y/x=k

Question 2

inverse linear proportion equation

Answer 2

y=k/x or xy=k

Question 3

how to rearrange formulas

Answer 3

solve it like any linear equation but do +- after square rooting smth

Question 4

direct proportion vs inverse proportion

Answer 4

direct: when one goes up, the other goes up
inverse: when one goes up, the other goes down

Question 5

k

Answer 5

constant of proportionality

Question 6

if a line passes through the origin, what is the gradient

Answer 6

k

Question 7

x and y are in direct non linear proportion if

Answer 7

y is proportionate to a power of x

Question 8

x and y are in inverse non linear proportion if

Answer 8

y is proportionate to a power of 1/x
the function is y=k/x^n
y varies inversly as x^n

Question 9

direct non linear variation equation

Answer 9

y = kx^n or y/x^n = k

Question 10

inverse non linear variation equation

Answer 10

y = k/x^n or yx^n =k

Question 11

when a problem says: varies directly with x, and inversly with y do

Answer 11

z=k(x/y)

Question 12

how to graph

Answer 12

use gdc