Question

A straight line passes through points (a; 0) and (0; b), where a; b not equal to 0 . Prove that the line has the
following equation:
bx + ay = ab

Answer 1

slope is -b/a (from the two points)
y = (-b/a) x + b

mult by a:
ay = -bx + ab

rearrange:
bx + ay = ab

Done.

Answer 2

thanks!