Slide 2:
Rule To subtract real numbers, add its opposite.
EX 3 – 5
-4 - (-9) 3 + -5 -2 -4 + 9 5
Slide 3:
EX -3 - 2
-3 - (-6) -3 + -2 -5 -3 + 6 3
Slide 4:
EX Evaluate –a - b for a = -3 and b = -5. -(-3) – (-5) 3 + 5 8
Slide 5:
EX Evaluate y – x + 6.8 for x = -2 and y = 7.2. 7.2 – (-2) + 6.8 7.2 + 2 + 6.8 16