Given below is the y-intercept and slope, respectively, of a line. 3 and 0 a. Determine whether the line slopes upward, slopes downward, or is horizontal, without graphing the equation. b. Find its equation. c. Use two points to graph the equation. a. The line because the is b. The equation is y= (Type an expression using x as the variable. Use integers or decimals for any numbers in the expression. Simplify your answer. Do not round.) c. Use the graphing tool to graph the line. A. $120 and $140 B. $140 and $160 C. $100 and $120 D. $80 and $100 Using the equation, the cost is $ (Simplify your answer. Type an integer or a decimal. Do not round.)