Question 465230
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Hi,
Note: 
*[tex \LARGE\ \ a_1x +b_1y = c_1 ]
*[tex \LARGE\ \ a_2x +b_2y = c_2 ]
 x+2y =3 
-x+2y =2 
D = {{{(matrix(2,2,1,2,-1,2))}}} = 1*2 - (2*-1) = 2 + 2 = 4
Note: {{{(matrix(2,2,a[1],b[1],a[2],b[2]))}}}= {{{a[1]b[2]-a[2]b[1]}}}