What is (-4,-7) and (-6,9) in slope intercept form

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

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

How can the correlation in the scatter plot graph below best be described? positive correlation negative correlation both positive and negative no correlation