Evaluate Algebra Expressions and Substitution

What is the variable in the expression y - 7

• 7

• y

• y-7

• There is not a variable

The sum of m and k

• mk

• m - k

• m + k

• m / k

Which is an algebraic expression?

• 3 + 1 = 4

• 4y = 12

• y + 6

• 7 - 2

What is the first thing you do when evaluating an expression

• Substitute value in for the variable

• Combine like terms

• Parenthesis

Evaluate 7 + j if     j = -2

• -14

• 14

• 5

• 9

If x = 3 evaluate x + 4 =

• 5

• 6

• 7

• 8

Evaluate 7y - 3y for y=2

• 40

• 73

• 8

• 4

• Substitute 3 for m

• Add 3 and 4 

• Multiply 3 and m

r(r – 9)
r = 11

• 12

• 22

• 44

• 99

Evaluate when a = 15:
2(a - 5) + 2

• 22

• 27

• 14

• 7