Formula for the slope of a line, given two points on that line slope = \(m = \frac{(y2-y1)}{(x2-x1)}\)

Substituting the known values for this problem and simplifying \(3=\frac{(7y-3)}{(-6-9)}\)

\(3=\frac{(7y-3)}{-15}\)

Cross-multiplying and solving

\(-45=7y-3\)

\(-42=7y\)

\(y=-6\)

Substituting the known values for this problem and simplifying \(3=\frac{(7y-3)}{(-6-9)}\)

\(3=\frac{(7y-3)}{-15}\)

Cross-multiplying and solving

\(-45=7y-3\)

\(-42=7y\)

\(y=-6\)