Which of these could be the first step to find the value of c

Lindsay used two points, (x, y; ) and (+2.82), to find the equation of the line, y = mx + b, that passes through the points. y2-y, first, she used the definition of slope and determined that the value of mis x, - . given this information, which expression must represent the value of b?

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

If g^-1(x) is the inverse of g (x) which statement must be true