Ineed finding y=8x+9 and 16x×2y=18

Write a real-world solution that can be represented by the equation y = 7x be sure to explain what the variables represented in the solution

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.

Solve 2x2 + 8 = 0 by graphing the related function. there are two solutions: . there are no real number solutions. there are two solutions: 2 and -2