If two equations graph as straight lines, can the system have exactly 2 solutions? Explain your answer, including ALL the possibilities of numbers of solutions. (tell the teacher how many solutions there can be, and what the graphs look like).
They either intersect at one point (one solution) or
They are parallel (no intersections at all....so...no solutions ) or
They are the same line and intersect at an infinite number of points
This might help : http://nogales.laurusmath.com/cpages/contents/pdf/HS-S3-C3-PO4-notes.pdf