Question 50652
Any equation that is in the form of a number times x plus or minus a number times y equal to a number term will ALWAYS be a straight line.  This form Ax+By=C is called the standard form of a line. 
 

Also, any equation in the form of y = mx + b (called the slope-intercept form of a line) is also a straight line.  


It's when you get x^2 or y^2 or division by x or y, like y = 12/x, etc.  Then this is NOT a straight line.


R^2 at SCC