so then y=-2x+3 the y intercept is 3 so go up 3 units on the y axis from the center (0,0) and put a point there the slope is -2 so slope is rise/run rise/run=-2=-2/1 so go down 1 units and go right 1 unit put another point there we get the opints (0,3) and (1,1) connect them see graph below
So what you would do is divide 988 by 26 and divide 731 by 17 and those two numbers you would add which gives you the amount of people that attended the performance