(x, y) = (- 4, 10) and (x, y) = (5, - 8) are points on the line

Aline has a slope of 1/4 and passes through point (0.4,-1/2). what is the value of the y-intercept?

Aflute is on sale for 20% off. including the discount and 8% tax, the sales price is $216.

Two planes leave an airport at the same time, one flying east, the other flying west. the eastbound plane travels 20 mph slower. they are 1600 mi apart after 2 hr. find the speed of each plane.