Question

Y varies indirectly as twice x. When x = 1, y = 3. Find y when x = 4.

Answer 1

'indirectly' is not a word working mathematicians use, but I am pretty sure this means that y = mx + c for some constants m and c.

Now saying x "varies ... as twice x" I take to mean m = 2.

That being the case, if x = 1 implies y = 3. Then

y = mx + c
3 = 2 times 1 + c
3 = 2 + c
c = 1

Hence

y = 2x + 1

Thus, when x = 4, y = ....

Answer 2

( @agd: you wrote down an equation for "y varies INVERSELY with x" )

Answer 3

I don't know what indirectly means :-(

Answer 4

thats alright....neither do i :(

Answer 5

xy = a constant; 1*3=3 so all xy products must equal 3. 4*x=3 so x=3/4