The following table shows the data collected from 2 random samples of 100 students from an after-school club regarding their favorite outdoor activity:

Sample Water Sports Hiking Fishing Total
1 50 35 15 100
2 50 40 10 100

Which of the following observations can be made about the number of students in the club who prefer water sports?
It is more than the number of students who prefer hiking and fishing combined.
It is less than the number of students who prefer fishing.
It is equal to the number of students who prefer hiking and fishing combined.
It is less than the number of students who prefer hiking.
(It's Driving Me Insane, And I Am On A Time Limit)

i used to know how to do this in 7th but i forget easily

step-by-step explanation:

55

step-by-step explanation:

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step-by-step explanation:

{x = -1/2 ,   y = -1

step-by-step explanation:

solve the following system:

{2 x + y = -2

{10 x - 3 y = -2

in the first equation, look to solve for y:

{2 x + y = -2

{10 x - 3 y = -2

subtract 2 x from both sides:

{y = -2 x - 2

{10 x - 3 y = -2

substitute y = -2 x - 2 into the second equation:

{y = -2 x - 2

{10 x - 3 (-2 x - 2) = -2

10 x - 3 (-2 x - 2) = (6 x + 6) + 10 x = 16 x + 6:

{y = -2 x - 2

{16 x + 6 = -2

in the second equation, look to solve for x:

{y = -2 x - 2

{16 x + 6 = -2

subtract 6 from both sides:

{y = -2 x - 2

{16 x = -8

divide both sides by 16:

{y = -2 x - 2

{x = -1/2

substitute x = -1/2 into the first equation:

{y = -1

{x = -1/2

collect results in alphabetical order:

answer:   {x = -1/2 ,   y = -1