Please assist me in working out how to get to the solution

3. Write equations of the horizontal and the vertical lines that pass through the point (9, - 9). What is the equation of the horizontal line? OA. y=-9 OB. y=9 QC. x=9 OD. x=-9 What is the equation of the vertical line? 1. Find the slopeintercept equation of the line that has the given characteristics. 13 Slope - 3 and yintercept (0, - 6) The slopeintercept equation is (Type an equation. Type your answer in slope-intercept form. Use integers or fractions for any numbers in the equation. Simplify your answer.) 2. Find an equation of the line having the given slope and containing the given point. - 5 7 2 m 6. ( l ) The equation of the line is y = (Type an expression using x as the variable. Simplify your answer. Use integers or fractions for any numbers in the expression.)