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To determine if Ron-Jon is correct or not, let's find the equation ourselves. Then, we need to find the slope. This can be done using the slope formula and Ron-Jon's two points.
Now that we know the slope we can substitute it into the point-slope form.
$y−y_{1}=-21 (x−x_{1})$
We can see that Ron-Jon got the correct slope so he might actually be correct with the equation. The second step for us is to substitute one of our points for $(x_{1},y_{1}).$ However, let's try both to be able to compare with Ron-Jon's equation.
$y−4y−2 =-21 (x−(-3))=-21 (x−1) $
Thus, we have two versions of the equation in point-slope form and neither matches Ron-Jons equation. $y−4=-21 (x−1).$
We can see that Ron-Jon used the $x$-value from one point and the $y$-value from another. This is wrong as you have to use the $x$- and $y$-coordinates **from the same point**. We have now found the error and the correct equations.

$m=x_{2}−x_{1}y_{2}−y_{1} $

$m=-3−14−2 $

SubTermsSubtract terms

$m=-42 $

ReduceFrac$ba =b/2a/2 $

$m=-21 $

MoveNegDenomToFracPut minus sign in front of fraction

$m=-21 $