find Dy for the simultaneous equations x-2y=-18;2x-y=9
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Answer:
x−2y=−18
2x−y=9
So by Cramer's rule ,
Δ=∣∣∣∣∣∣12−2−1∣∣∣∣∣∣=3
Δx=∣∣∣∣∣∣−189−2−1∣∣∣∣∣∣=36
Δy=∣∣∣∣∣∣12−189∣∣∣∣∣∣=45
Hence,
x=ΔΔx=336=12
y=ΔΔy=345=15
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