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Question

Solve the following pairs of linear (simultaneous) equations using method of elimination by substitution:

3x25y3+2=0

x3+y2=216

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Solution

x3+y2=216x3+y2=136(2x+3y)6=1362x+3y=132x=133yx=(133y)23x25y3+2=03x2[(133y)2]5y3=2(399y)45y3=2(11727y20y)12=211747y=2447y=141y=3x=(133×3)2x=42x=2​​​​​​​


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