7x + 3y = 15 ; 12y - 5x = 39
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12y-5x=39
-5x+12y=39
d = 7 3
-5 12
= 7 x 12 - (-5) x 3
= 84 + 15
= 99
dx= 15 3
39 12
= 15 x 12 - 39 x 3
= 180 - 117
= 63
dy = 7 15
-5 39
= 7 x 39 - (-5) x 15
= 348
by cramer's rule
x = dx/d
= 63/99
= 7/11
y= dy/d
= 348/99
= 116/33
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