Sure thing, honey. If a equals 8, then you just substitute that bad boy in for a in the expression a-2. So, 8-2 equals 6. Ta-da! Your answer is 6. Hope that clears things up for ya, sugar.
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x=y-8 z=x+12
0.5*8=.40
20.
explain how to evaluate an algebraic expression for given variables. how would we evaluate the expression "3x-4y+9" when x=2and y=5?
-11