When using a number line, in which direction should you move when subtracting a negative value?

Find the equation using the point (4,8)

Offering 30 if a plus b plus c equals 68 and ab plus bc plus ca equals 1121, where a, b, and c are all prime numbers, find the value of abc. the answer is 1978 but i need an explanation on how to get that.

If x is 6, then 7x= a. 13 b. 42 c. 42x d. 76