Solve the simultaneous equations y=x-5 and 10y=2x+6 by elimination, and by substitution.
Elimination:
Multiply equation (eqn) 1 by 2: 2y=2x-10
Subtract modified eqn 1 from 2: 8y=16
Divide through by 8: y=2
Sub y=2 into eqn 1 or 2 and rearrange to find: x=7
Subsitution:
Sub eqn 1 into eqn 2: 10x-50=2x+6
Rearrange: 8x=56
Divide through by 8: x=7
Sub x=7 into equation 1 or 2 and rearrange to find: y=2
JR
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