- #1
Lilt
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Homework Statement
Let S be the set of all lines with equation y = mx+b for which m+b = 36. For how many of the elements of S are both the x- and y-intercepts integers?
Homework Equations
y = mx+b for which m+b = 36
The Attempt at a Solution
I'm just not wrapping my mind around the steps in the solution here:
Denote by (a,0); (0, b) correspondingly x-intercept and y-intercept
of a line. Adding the equalities given in the problem and simplifying the result,
we will come to the equation of the set of the lines y = (m-1)x+36
of a line. Adding the equalities given in the problem and simplifying the result,
we will come to the equation of the set of the lines y = (m-1)x+36
From that point onward, I can see and work through the steps. If I were to add these two equations, then I get y = mx + m + 2b - 36. I figure there's substitution occurring for their simplification, but I'm oblivious to it.
edit: Oh jeez, and I posted this in the wrong subsection. Should I re-post it, or will this be moved? Sorry about that!
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