Question 149515
How do I solve the following system of linear equation 
5x + 4y = 40 
x + 2y = 11
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There's more than one way. I like determinants (I have an Excel sheet that does them).

5  4  -40
1  2  -11
Det = (5*2)-(1*4) = 6

x*Det = 4*(-11)-2*(-40) = 36
x = 6
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y*Det = -(5*(-11) - 1*(-40)) = 15
y = 2.5