Question 1208355
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                    It is as simple a a cucumber.



<pre>
You simply write  2x + 5y = 2*(-10) + 5*1,  artlessly substituting the coordinates (-10,1) instead of x and y into the formula.


Then you calculate right side value  2*(-10) + 5 = -15.


Now your equation is  2x + 5y = -15.    <U>ANSWER</U>


At this point, the solution is complete.
</pre>

Solved and explained.