Question 1147139
<pre>First use the slope formula: 

{{{m=(y[2]-y[1])/(x[2]-x[1])}}} with

(x<sub>1</sub>, y<sub>1</sub>) = (2, -1), and (x<sub>2</sub>, y<sub>2</sub>) = (5, -10)

to find the slope m.

Then use the formula

{{{y-y[1]=m(x-x[1])}}}

Only substitute numbers for m and for (x<sub>1</sub>, y<sub>1</sub>).
Do not substitute any numbers for x or y, but leave them as the letters
x and y.  Then simplify and solve for y.

Edwin</pre>