Its asking to solve for y and the rest​

3. solve by graphing: y = 2x + 6 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

What is the area of a triangle with vertices at (-3 3) (-3,2) and (1,2)?