Which equation results from adding the equations in this system? x + 6 y = 9. negative x + 2 y = negative 15.

Step-by-step explanation:

x + 6y = 9

-x + 2y = -15

add

8y = - 6 <=== u see that the x terms cancel each other out

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)

15 batches are the most you can make

step-by-step explanation: