15. Find the sum of 16y and -5y?
16. Find the difference of 10x'y and 2x'y
17. Subtract 9a from -15a
18. From -9cd?, subtract -2cd?

Malia is observing the velocity of a cyclist at different times. after two hours, the velocity of the cyclist is 15 km/h. after five hours, the velocity of the cyclist is 12 km/h. part a: write an equation in two variables in the standard form that can be used to describe the velocity of the cyclist at different times. show your work and define the variables used. (5 points) part b: how can you graph the equations obtained in part a for the first 12 hours? (5 points) if you can try and make this as little confusing as you can

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?

If abcde is reflected over the x-axis and then translated 3 units left, what are the new coordinates d?