What is the equation of a horizontal line that has a y-intercept of -5?

Which statements about these triangles is true

Solve: 3x+y=6 4x-2y=18 show all work !

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.