Question

Indicate in standard form the equation of the line passing through the given points. P(6, 2) , Q(8, -4)

Answer 1

y = m x + b
2 = 6 m + b
-4 = 8 m + b /*(-1 )
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2 = 6 m + b
+
4 = - 8 m - b
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6 = - 2 m
m = - 3
2 = 6 * ( - 3 ) + b
2 = - 18 + b
b = 20
The equation is:
y = - 3 x + 20 ( or in the other form: 3 x + y - 20 = 0 )