On the first day of a trip, ricky drove 200 miles in 10 hours. at that rate, how many miles did he drive in 1 hour?

200/10. = 20 miles per hour
So he drove 20 miles in an hour

200/10=20 m per hour

You move the constant to the right side and change its sign to be 9z= -6 -8. that’s the first step.the second step would be calculate the difference of -8-6 to get -14. you equation should now be 9z=-14the last step is to divide both sides by 9 to get z=-14/9hope this