Given 2x-2y=23 find x when y=9

x= 20, 5

Step-by-step explanation:

Sub y into equation to find x

2x - 2 (9)= 23

2x-18 =23

2x= 23+18

2x= 41

x=41/2

x= 20,5

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)