Which of the following best describes the expression 9(x + 7)? The sum of constant factors 9 and x + 7
The product of constant factors 9 and x + 7
The product of a constant factor 9 and a 2-term factor x + 7
The sum of a constant factor 9 and a 2-term factor x + 7

Which statements are true? check all that apply. the line x = 0 is perpendicular to the line y = –3. all lines that are parallel to the y-axis are vertical lines. all lines that are perpendicular to the x-axis have a slope of 0. the equation of the line parallel to the x-axis that passes through the point (2, –6) is x = 2. the equation of the line perpendicular to the y-axis that passes through the point (–5, 1) is y = 1.