7x-5y+2z=12 , 6x+9y-5z=15, 5x+7y+8z=18 solve by cramer's rule
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Given equations are 3x+4y+5z=18,2x−y+8z=13,5x−2y+7z=20
D=∣∣∣∣∣∣∣∣3254−1−2587∣∣∣∣∣∣∣∣=3(−7+16)−4(14−40)+5(−4+5)
=3(9)−4(−26)+5(1)=27+104+5=136
D1=∣∣∣∣∣∣∣∣1813204−1−2587∣∣∣∣∣∣∣∣=18(−7+16)−4(91−160)+5(−26+20)
=18(9)−4(−69)+5(−6)=1
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