slope=m= - 1/2
point =(x1,y1) = (4 , -1)
slope-point form is;
y- y1 = m (x - x1)
substituting above values
y- (-1) = - 1/2 (x -4)
y +1 = - 1/2 *x +4/2
y+ 1 = - 1/2 * x + 2
y = - 1/2 * x + 2 -1
y = - 1/2 *x + 1 (It is in the form of y = mx + c )[slope =m, y- intercept = c]
therefore ,
m= -1/2, y-intercept = c= 1