Use the graph (for example, by marking specific points) to illustrate the statements in (a)-(d). if possible, label the coordinates of any points you draw.

One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-9)

On a string instrument, the length of a string varies inversely as the frequency of its vibrations. an 11-inch string has a frequency of 400 cylces per second. find the frequency of a 10-icnch string.

The lengths of all sides of a triangle are integers when measured in decimeters. one of the sides has length of 1 dm and another of 3 dm. find the perimeter of the triangle.'