compare the slopes of the lines for y= f(x) and y = g(x) to determine f each pair of lines is parallel

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

Solve the system of equations y= 3/2 - 1, -x+ y =-3

Cody started biking to the park traveling 15 mph, after some time the bike got a flat so cody walked the rest of the way, traveling 4 mph. if the total trip to the park took 6 hours and it was 46 miles away, how long did cody travel at each speed? solve using rate times time= distance