A motor home starts across a lake. The lake is 7 miles long and it takes 0.5 hours to get across. What is the speed? Write a formulae and show a label.
Just substitute the first equation into the second and solve for x: <span><span>32</span>x=−<span>12</span>x+4⟹2x=4⟹x=2</span><span>Now, since y = 3/2 * x, we have y = 3 and we are done.</span>