HELP!!

In 5-8, write an equation of the trend line in slope-intercept form.

First, find out the y-intercept(s).

For 5, it is 6. For 6, it is 150. For 7, it is 20. For 8, it is 0.

Now we need to find the slopes.

For 5, it goes down one and right 2, so it would be -1/2 (rise/run).

For 6, it goes up 100 and right 2, so it would be 100/2 (rise/run) or 50.

For 7, it goes up 10 and right 3, so it would be 10/3 (rise/run).

For 8, it goes up 25 and right 1, so it would be 25/1 (rise/run) or 25.

Then you plug into the equation: y = mx + b

5: y = -1/2x + 6.

6: y = 50x + 150.

7: y = 10/3 + 20.

8: y = 25x + 0 which would be y = 25x (since add 0 is useless).

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answer: a video game has three difficulty levels: easy, medium, and expert. the game's scoring works in such a way that a player has to score a fixed number of points to advance to the next level, and then the scoring starts over. the total score needed to clear all three difficulty levels is 7,500. two times the number of points needed to clear the easy level is 500 more than the number of points needed to clear the medium level. twice the number of points needed to clear the medium difficulty level is 1,500 more than the number of points needed to clear the expert level. if x, y, and z represent the easy, medium, and expert levels, respectively, and a is the coefficient matrix of the system of equations modeling this situation, identify the inverse matrix, a-1, and the solution matrix, x, of the system of equations.

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