Representing Numbers Using Letters Replacing Variables

y = 8b + 3  for b = 7

• 54

• 49

• 53

Is the answer correct?  y + 3 = 32 

• Yes

• No

y = p + 5  for p = 20

• 26

• 27

• 25

2(b) + 8= __________
b=2

• 12

• 10

• 16

• 8

a symbol for an unknown value; usually a letter (such as a, x, or y) is the symbol used

• constant

• variable

• coefficient

• term

What is the definition of a variable?

• A letter or symbol that represents an unknown quantity

• The little number or letter used to raise to a power

• The number in front of a variable

• The number with no variable

2(c) + 5=_______________
c= 6

• 15

• 17

• 13

• 11

2(b) - 3=______
b=5

• 2

• 10

• 1

• 7

math phrase that combines numbers AND variables (letters: 3b or 5x) by using (+, -, *, ÷). *does not have an equal sign (=)

• algebraic expression

• equivalent expressions

• reduce

• substitution

• ratio

replacing a variable with a number or expression

• equivalent fractions

• substitution

• evaluate

• equivalent expressions

• similar figures