25% of 16 is 4 so 16+4 is 20 slices of pizza
Y =0.5x +2 The y-intercept is found by the coordinates (0,2) and the change is 0.5
X + x+2 + x+4 + x+6 +x+8 + x+10 + x+12 + x+14 + x+16 + x+18 = 1190
Now simplify
10x + 90 = 1190
10x = 1100
x = 110
Now plug in 110 for x