It takes Betsy 15 minutes to make lunch. How many seconds does it take her to make lunch? *

900 seconds

Step-by-step explanation:

15*60

900 secs

Step-by-step explanation:Divide 15 by 60 and you get 900.Each minute is 60 so. You can add it 15 times and get 900

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18