I need to show how I worked out the solution
if 4x + 3y + 7m = 11.5 and 3x + 1y + 9m = 10 ; what is the sum of 1x + 1y + 1m
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Multiply the first equation by 2, subtract the second equation from it, divide the result by 5:
From the second equation y=10-3x-9m; Plug it into the first equation to get:
4x+3(10-3x-9m)+7m=-5x-20m+30=11.5 From this we obtain upon simplification:
x+4m=3.7 Thus x=3.7-4m; Plug it in the expression for y to obtain:
So, we have: