The difference of twice a number and 3 is -21 translated

2x-3=-21.

2x=-21+3.

2x=-18.

x=-18/2.

x= -9.

Step-by-step explanation:

Let the number be x.

The difference of two values is the result from subtracting them.

Add 3 to both sides.

Divide both sides by 2.

The number is -9.

  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.