What is the equation of a line that passes through (0,8) and (0,4)

In what form is the following linear equation written y=9x+2

Which function has the domain x> -11?

Gabriel determined that his total cost would be represented by 2.5x + 2y – 2. his sister states that the expression should be x + x + 0.5x + y + y – 2. who is correct? explain.