Question

to verify that 1/5(5x-20)-1/2(4x-8) is equivalent to -x. Which procedure can I follow to determine if the two expressions are equivalent? Add the two expressions, put an equal sign between the two expressions and solve for x, substitute 5 into the first expression, substitute 4 into the second expression, and evaluate the, OR substitute 5 into each expression and evaluate them?

Answer 1

Explanation:

There are multiple ways in which you could do this problem.

One would be to carry out the indicated multiplication:

x - 4 - 2x + 4, or -x. Obviously, this equals the given -x.

Answer 2

Substitute 5 into each expression and evaluate them.

Explanation:

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