Question 252699
100 at 750
150 at 1050
so the last 50 cost 300
300/50=6 dollars each
100*6=600
750-600=150
so the caterer charges 150 plus 6 dollars per person
check
150+150*6=50+1000

x+100y=750
x+150y=1050
subtract second from first
50y=300
y=6
x+6*100=750
x=150