From here, we should see that both are equal to each other and if we graph them, they would be the same line. Therefore, any value of <em>x</em> works so our answer is infinite amount of solutions.
In order to get this answer, you have to figure out how many km 10% is, 0.1125. Then multiply that by the remaining 20% because he already finished 80% of the trail. So, 0.1125 x 20 = 2.25.
