8. A line passes through the polnts (-1, 4) and (2,-2). What is the equation of this line? 9. A line with a slope of 2 passes through the point (2. 1). What is the equation of this line?

8.y=-2+2

9. y=2-3

Step-by-step explanation:

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)