You can
put this solution on YOUR website! .
It is as simple a a cucumber.
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. ANSWER
At this point, the solution is complete.
Solved and explained.