Question 391676
 x/a + y/b = 1
y/b = 1 - x/a
y = b - xb/a 
y=b when x=0, the y intercept.
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y = b - xb/a 
b - xb/a = 0
ab - xb = 0 multiply each side by a
a-x=0 divide b by each side.
-x=-a
x=a the x intercept when y=0.
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Ed