[size=150]Use this interactive sheet to type in any two linear equations in x and y and see if there are solutions graphically.[br][br]The two lines are either[br][br](i) intersecting each other at a point, with exactly one pair of x and y value satisfying the equation[br][br](ii) coincident lines, which means there are infinite number of pairs of x and y values that satisfy both equations (which are equivalent equations)[br][br](iii) parallel lines, where both lines have the same gradient but not the same y intercept, which means there are no solutions which will satisfy both equations![/size]