x=# of pigs
y=# of chickens
x+y=220
Pigs have 4 legs and chickens have 2 legs.
4x+2y=520
Multiply each term of x+y=220 by -2.
-2x-2y=-440
add the two equations
2x=80
x=40 pigs
220-40=180 chickens
Another solution...
x=220-y
4(220-y)+2y=520
880-4y+2y=520
880-2y=520
-2y=-880+520
-2y=-360
y=180 chickens
220-180=40 pigs
Answer:
b=40-5a/2
Step-by-step explanation:
5a+2b=40
2b=40-5a
pls mark brainliest
Total Cost in a day is . Profit function is . And the revenue function is . In a day, bookstore must sell at least 15 books, because of 6n-90=0, in order to make profit.
-90
500
1/10 of 5000 is 500.
500 x 10 = 5000
