7x+3y=15;12y-5x=39by Cramer rule
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7x +3y=15 -----1 12y- 5x=39-------2 5x-12y=39-----3 multiply 1 equaton by 4 4( 7x+3y =15) 28x+ 12y=60----4 3+4 28x+12y=60 5x-12y=39 ------------- 33x=99 x=3 put x=3 in eq 1 7x+3y=15 7×3+3×y= 15 21+3y= 15 21- 15=-3y 6= -3y y= -2
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