Ateacher buys 50 train tickets for a school trip for a total cost of $1,200. she buys x number of student tickets for $20 each. she also buys y number of adult tickets for $30 each. how many adult tickets did she buy?

y=20 , x =30

Step-by-step explanation:

x+y=50;  

20x+30y=1200

20x+20y=1000, multiplying the top by 20

-20x-30y=-1200, subtracting the second.

-10y=-200

y=20 adult tickets ($600)

x=30 student tickets ($600)

(add up to $1200)

answer:   (s+1)(s+4)

step-by-step explanation:

factor s2+5s+4

s2+5s+4

=(s+1)(s+4)