Question 1087877
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<pre>
The expression for the slope gives this equation

m = {{{(y[2]-y[1])/(x[2]-x[1])}}},   or  2 = {{{(j-(-7))/(8-9)}}},


which is the same as 


{{{(j+7)/(-1)}}} = 2,


which is equivalent to

j + 7 = -2. 


Hence, j = -2 - 7 = -9.


<U>Answer</U>.  j = -9.
</pre>

Solved.