When you evaluate an expression, you substitute a number in for a variable. For example, to evaluate the expression 4y+3 for y=6, you would substitute 6 for “y”. You would then solve using the order of operations. So 4(6)+3= 27.
You can also simplify algebraic expressions without knowing what the variables equal. For example, in this expression (6k+5)+(3k-7), you would add together the coefficients (numbers) in front of “k” and add together the constants or numbers. Adding or subtracting the same variables together is called combining like terms. So, you would combine 6k+3k which would equal 9k and you would combine the constants, 5+-7 which would equal -2.
When you evaluate an expression, you substitute a number in for a__________. For example, to evaluate the expression 4y+3 for y=6, you would substitute 6 for “y”. You would then solve using the order of operations. So 4(6)+3=____. You can also simplify algebraic expressions without knowing what the variables equal. For example, in this expression (6k+5)+(3k-7). You would add together the coefficients (numbers) in front of “k” and add together the constants or numbers. Adding or subtracting the same variables together is called combining_________. So, you would combine 6k+3k which would equal 9k and you would combine the constants, 5+-7 which would equal_____.
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