SOLUTION: Show how you use matrices to write an equation for a line that passes through the following points: (-7, 9), (8, 9)

Question 1199703: Show how you use matrices to write an equation for a line that passes through the following points:
(-7, 9), (8, 9)
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Show how you use matrices to write an equation for a line that passes through the following points:
(-7, 9), (8, 9)
--------------------

| x   y   1|
|-7   9   1| = 0
| 8   9   1|

x*(9-9) - y*(-7-8) + 1*(-7*9 - 8*9) = 0
15y -135 = 0
y = 9

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