2x – 3y = -1
11x - 9y = -13

Step-by-step explanation:

2x - 3y = -1equation 1

11x - 9y = -13 equation 2

Now multiplying equation 1 by 3 and solving both equations

6x - 9y = -3

11x - 9y = -13

-+= +

- 5x = 10

Therefore x = -2

Now putting x = -2 in equation 1

2 * (-2) - 3y = -1

-4 - 3y = -1

-3y = -1 +4

-3y = 3

Therefore y = -1

x = - 2

y = - 1

Step-by-step explanation:

2x – 3y = - 1   | (-3)

11x - 9y = - 13

- 6x + 9y = 3

11x - 9y = - 13

11x - 6x = 3 - 13

5x = - 10

x = - 2

2(-2) - 3y = - 1

- 4 - 3y = - 1

1 - 4 = 3y

3y = - 3

y = - 1

You could say that it gives a reasonable accurate measure for most students.

If you use the function, you will get the following values for each student.

Mike 86, Terrel 50, Janie 66, and Melissa 106

For the first two students, the equation produces a score that is almost perfect. For the second two students, the scores are off by 14 and 16.

Overall, it is not a bad trendline for the data.