Line J has a y-intercept of 6 and passes through point (a,b). What is the slope of Line J in terms of a and b?

GMAT QUANT Problem Solving level 600, Coordinate Geometry, slop
Line J has a y-intercept of 6 and passes through point (a,b). What is the slope of Line J in terms of a and b?

A. (a−6)/b
B. (a−b)/6
C. (6−a)/b
D. (6−b)/a
E. (b−6)/a