Lisa,
Your question states, "find the slope," but the slope is given. I'm going to assume it should say "find the equation of the line." If I'm wrong, please restate your question.
slope = m = 6/7
y-intercept = b = 4
Slope intercept form of an equation of a line is
y = mx + b
y = (6/7)x + 4
Restated in standard form (included only because I'm not sure of the exact question.
7y = 6X + 28
-6x + 7y = 28
