Do I write the equation y=mx+b

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.

Find the equation of the line with slope =8 and passing through (6,53) write your equation in the form y=mx+b

What is the factored form of the following expressions? d^2 – 13d + 36