How do you graph a linear equations in two variables explain? - Answers

For each linear equation the procedure is the same: Suppose the equation is y = mx + c where x and y are the two variables and m and c are two constants. Set x = 0 so that the equation becomes y = c. Mark the point P = (0, c) on the coordinate plane. Set y = 0 so the equation becomes 0 = mx + c so that x = -c/m. Mark the point Q = (-m/c, 0) on the plane. Join PQ with a straight line and extend in both directions. You may wish to select another value of x (or y), substitute into the equation and solve. This will give the coordinates of a third point, R. The only reason for doing this is that if R is not on the line PQ then you know you have made a mistake. Repeat for other equations.