-x + y = 1
-7x + 6y = -1
use substitution to solve

x=7, y= 8

Step-by-step explanation: y= x+1, put in 2nd equaiton to get, -7x + 6x+6 =- 1, -x = -7, x=7. -7+y=1 ,y=8

(x,y)=(7,8)

Step-by-step explanation:

-x + y = 1

-7x + 6y = -1

x=-1+y

-7(-1+y)+6y=-1

7+(-7y)+6y=-1

-y=-8

y=8

x=-1+8

x=7

step-by-step explanation:

options

85.560%

step-by-step explanation:

conditional probability is defined as:

p(a|b) = p(a∩b) / p(b)

in other words, the probability that a occurs, given that b has occurred = the probability that both a and b occur / the probability that b occurs.

in this example:

p(turns 64 | turns 44) = p(turns 64 & turns 44) / p(turns 44).

if someone turns 64, they must have already turned 44, so:

p(turns 64 | turns 44) = p(turns 64) / p(turns 44)

on page 42, we see that of the original 100,000, 94944 turn 44, and 81234 turn 64.   therefore:

p(turns 64 | turns 44) = 81234 / 94944

p(turns 64 | turns 44) = 0.85560