If y = 3, what is 2y - 4?

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Multiple Choice

If y = 3, what is 2y - 4?

Explanation:
Evaluating an algebraic expression by substituting a given value and simplifying. Replace y with 3 in 2y - 4 to get 2(3) - 4. Compute 2 times 3 to get 6, then subtract 4 to get 2. So the expression equals 2. This shows how plugging in a number and following the order of operations gives the result. If you forget the subtraction, you'd get 6; if you switch to adding instead, you'd get 10, which is not the value here. The correct result is 2.

Evaluating an algebraic expression by substituting a given value and simplifying. Replace y with 3 in 2y - 4 to get 2(3) - 4. Compute 2 times 3 to get 6, then subtract 4 to get 2. So the expression equals 2. This shows how plugging in a number and following the order of operations gives the result. If you forget the subtraction, you'd get 6; if you switch to adding instead, you'd get 10, which is not the value here. The correct result is 2.

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