If y varies directly with x and y = 10 when x = 2, what is the value of y when x = 5?

If y varies directly with x, and y = 20 when x = 5, what will x equal when y = 10?

What is the slope-intercept form of a linear equation through the points (2, 3) and (4, 7)?

If the slope of a line is 3 and passes through the point (0,-2), what is the equation of the line in slope-intercept form?

If a line passes through the point (-2, 5) and has a slope of -3, what is the equation of the line in point-slope form?