The equation of the line below can be expressed in the form\frac{x}{a} + \frac{y}{b} = 1.Find a.
Slope = [ 4 - - 5 ] / [ 5 - - 1] = 9/6 = 3/2
Equation of the line
y = (3/2)(x -5 ) + 4 multiply through by 2
2y = 3(x -5) + 8
2y = 3x - 7
3x - 2y = 7 divide through by 7
(3/7)x - (2/7)y = 1 and we can write
x / (7/3) - y / (7/2) = 1
a = 7 / 3
+452 
