Question 1199703
Show how you use matrices to write an equation for a line that passes through the following points:

(-7, 9), (8, 9)
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<pre>
| x   y   1|
|-7   9   1| = 0
| 8   9   1|
</pre>
x*(9-9) - y*(-7-8) + 1*(-7*9 - 8*9) = 0
15y -135 = 0
y = 9