Explanation
No, this is not correct.
From the graph, we can see the the line is downward sloping, not upward sloping. So the gradient should be a negative number. You probably just forgot a negative sign somewhere in your calculation. Also, the "\(+c\)" in the equation \(y=mx+c\), doesn't stand for \(x\)-intercept. Remember, "\(c\)" is the \(y\)-intercept.