Rite an equation of the line with the given​ slope, m, and​ y-intercept (0,3). The equation is

m=0, b=-5

​(Simplify your answer. Type your answer in​ slope-intercept form. Use integers or fractions for any numbers in the​ equation.)

Which equation represents the function on the graph?

What is the value of x when x + 7 = 21?

Every weekday, mr. jones bikes from his home to his job. sometimes he rides along two roads, the long route that is shown by the solid lines. other times, he takes the shortcut shown by the dashed line. how many fewer kilometers does mr. jones bike when he takes the shortcut instead of the long route?