Question 1151534
what is the equation of a line that goes through (3,2) and (12,1)?
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<pre>

| x   y   1|
| 3   2   1| = 0
|12   1   1|

</pre>

x*(2*1 - 1*1) - y*(3*1 - 12*1) + 1*(3*1 - 12*2) = 0
x + 9y - 21 = 0 is AN equation, not "the" equation.