you need to get a common denominator
the common denominator is 40
3/8 * 5/5 = 15/40
2/5 * 8/8 = 16/40
25 15/40 < 25 16/40 so Karen rode farther
Let's use the point-slope formula here:
y - 5 = -2(x - 3). That's it. You could, of course, rewrite this in slope-intercept form, as follows:
y = 5 - 2x + 6, or y = -2x + 11, in slope-intercept form.