You are a partner in your group with their problem. what mistake did they make solving the system?
3x+y-9
-2x+y=4

students work when solving the second equation for y:
y=2x+4
-2x+(2x+4)=4
-2x+2x+4=4
4=4

the students response is there are indefinitely many solutions and this is not correct. explain the mistake.

The means and mean absolute deviations of the individual times of members on two 4x400-meter relay track teams are shown in the table below. means and mean absolute deviations of individual times of members of 4x400-meter relay track teams team a team b mean 59.32 s 59.1 s mean absolute deviation 1.5 s 245 what percent of team b's mean absolute deviation is the difference in the means? 9% 15% 25% 65%

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?

Add the fractions and simplify 1/2+ 1/3