10) → michael paid $8.40 for a dvd after having been given a 30% discount.
what was the presale price of the dvd?
on my elementary math class on college i don’t know where to start this needs to be shown full work

Step-by-step explanation:

If the presale price is ,

then

Thus the presale price is $12.0

  y= -3x is the required function.

step-by-step explanation:

we have been given a table:

x             y

0             0

1             -3

3             -9

-2             6

we can see that the values of y is -3 times the value of x

hence, the function would be: y= -3x.

put the values of x will give the same y as in the table that means function is satisfying the given table.