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For each of the following straight lines, determine the gradient and the y-intercept without drawing the line.
(a) 5x - 3y + 6 = 0
(b) #3/2# y - 15 = #2/3#x
(c) 2(x + y) = 4
(d) #1/3#x + #2/5#y + #1/6# = 0
(e) -10(x +3) = 0.5y
(f) ax + by + c = 0