Each equation has a graph which is a line. Every point on the line is a solution to that equation. The solution to the system of equations is the point that is on both lines. The solution of the system of equations is the point that is a solution to both equations. It is the point of intersection of the two lines.
Read the coordinates of the point of intersection of the blue line and the red line.
Start at (0, 0). Go right 1 unit. Now you have x = 1. From there go up 3 units. Now you have y = 3. The point that corresponds to x = 1 and y = 3 is the point (1, 3).
The price: - last year: $2.25 - this year: $.45 The decrease: $2.25 - $.45 = $1.80 2.25 : 1.80 = 100 : x 2.25 x = 180 x = 180 : 2.25 x = 80 Answer: The percent of decrease is A ) 80%
