What is the equation of the line that has a slope of 3 and a y- intercept of - 12?

For how answer my question this will be the last question can you answer in math subject

Use circumcenter theorem to solve for the given values

Which best describes the construction of a triangle if given the segment lengths of 2 cm, 3 cm, and 5 cm? a) unique triangle b) cannot be determined c) triangle not possible d) more than one triangle