Page 29 - Math Course 1 (Book 1)

Subtracting Integers

MO. 1 - L4b -4 - 6 = -4 + (-6) = -2
Evaluate Expressions 4 - (-6) = 4 + (6) = 10

Containing Variables

Key Concept

Subtracting Integers

Words: To subtract an integer, add its additive
inverse.

Symbols: a - b = a + ( -b )
Let’s Begin

Examples Evaluate Algebraic Expressions

Evaluate m – (–2) if m = 4. Evaluate x – y if x = –14 and y = –2.
m – (–2) = 4 – (–2) Write the expression. x – y = –14 – (–2) Write the expression.
Replace m with 4. Replace x with -14 and
y with -2
= 4 + 2 To subtract –2, add 2.
= -14 + 2 To subtract –2, add 2.
= 6 Add 4 and 2.
= -12 Add 4 and 2.

Answer 6 Answer -12

Your Turn! Evaluate Algebraic Expressions

Evaluate p – (–6) if p = –4. Evaluate m – n if m = –9 and n = –3.
A.10 C. 2 A. -12 C. 6
B. -2 D. -10 B. -6 D. -27

Answer Answer

21