Question 167434
Graph the line {{{2x+5y = 18}}} and then find the points on the graph that intersect the integer grid. You'll the only two points that fall on integers grid is (9,0) and (4,2)
{{{graph(400,400,-10,10,-10,10, (18-2x)/5)}}}


Use {{{9x + 8y = 100}}} 

4x + 6y=125 can;t happen since no combination of even numbers can add to an odd result

5x+10y must end in either 5 or 0. No way to get to 112

Last one:
1)Graph and see if there are points on the grid (assumes grid is on integers)
2)Plug and try (100,91,82,73,64,55,46,37,28,19,10,1) Any any of those evenly divisible by 6? I dont think so