During the construction of the metro tunnel, a team of tunnellers walked 0.8 m every day during the week

During the construction of the metro tunnel, a team of tunnellers walked 0.8 m every day during the week. In x days, the length of the tunnel increased by a few meters. Express it with x. Is the dependence of y on x directly proportional? Find the values of y at x = 1; 3; 7.

According to the condition of this task, it is required to express the dependence of the length of the tunnel on the number of days. Since every day the team passed 0.8 meters, the dependence will be directly proportional, and the expression for the dependence will be: y = 0.8x; Next, we find the values of y for given values of x:

x = 1; y = 0.8 * 1 = 0.8 (m);

x = 3; y = 0.8 * 3 = 2.4 (m);

x = 7; y = 0.8 * 7 = 5.6 (m);