What is the result of subtracting the second equation from the first?
8x – 4y = -4
- 3x + 4y = 5

7x+8y=-18, 4x-9y=-3 solve the system of equations

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. how many hours after the truck's departure will the two meet?

Is the point (0, 8) on the x-axis or y-axis? how do you know?