solve by elimination 2x+8y=6, -5x-20y=-15

Question

Answer I get is (0,0). Does seem right.

Answer 1

Actually, these two equations represent the same line, and therefore has an infinite number of solutions.  For example, if x=0, y=¾,  If y=0, x=3.  Therefore, two solutions are (0, ¾), and (2, 0).

 

Any number you chose for x, has exactly one value for y.

Answer 2

That's because they are the same equation! Divide the first by two and second by negative five. You will need a different equation with x and y for a Non zero solution.