What are like terms?

• Any terms are like terms

• Terms that have the same variable and same exponent

• Terms that are the same sign (positive and negative)

• Terms that have the same variable only

• add 5 to both sides
• divide both sides by 2
• x=20
• subtract 5 from both sides
• multiply both sides by 2
• divide both sides by 5
• subtract 2 from both sides
• x=15

Mathematical Equivalence

ON

x is less than or equal to 4

​ (a)   ​ ​ (b)   ​ (c)  

• <
• >

Which graph is NOT a function?

Mathematical Equivalence

ON

• 17.5

• 1

• 11

• 5

• 18

Which set of values IS a function?

• (9,5) (10,5) (9,-5) (10,-5)
• (3,4) (4,-3) (7,4) (3, 8)
• (6,-5) (7, -3) (8, -1) (9, 1)
• (2, -2) (5, 9) (5, -7) (1, 4)

Mathematical Equivalence

ON

• {0, 2, 4, 6}

• {-2, 0, 2, 4}

• {-4, -2, 0, 2}

• {-6, -4, -2, 0}