Expressions with Substitution

Which expression does not equal 21?

• 3x  when  x = 7

• 42/y when  y = 2

• 18 + e   when e = 4

• 30 - j   when j = 9

 $Evaluate\ 4-x\ when\ x=2$  

Which part of the expression is the variable? 5a + 2

• 5

• a

• +

• 2

Which part of the expression is the coefficient? 3 x 5s

• 3

• x

• 5

• s

 $a\div2$  Solve for a if a= 24

• 48

• 22

• 12

How many terms does the expression have? 2x

• 1

• 2

• 3

12 + n = ______________
n=4

• 18

• 20

• 16

• 12 + 4n

y - 6=__________
y=10

• 4

• 1

• 16

• 10