Answer:
there are 200 pizzas and 300 hamburgers
Step-by-step explanation:
Let x be the hamburgers and y be the pizza
500 = y+x
500-y = x
2y+3x = 1300
Substitute x in
2y+3(500-y) = 1300
Simplify
2y+1500-3y = 1300
-y+1500 = 1300
y = 200
500-200 = 300
there are 200 pizzas and 300 hamburgers