The equation x = 2m-1, y = 4-m, using the algebraic expression containing x to express y, then y=__________
y=4-m
m=4-y
Substituting x = 2m-1
x=2(4-y)-1
2(4-y)=x+1
4-y=(x+1)/2
y=4-(x+1)/2
y=(-x+7)/2
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