Download presentation

Presentation is loading. Please wait.

Published byLucy Brown Modified over 4 years ago

1
Lesson 1.1 Objective: To solve equations using addition, subtraction, multiplication, and division Are operations that undo each other such as addition and subtraction. Inverse operations: Isolating the Variable: Vocab: means to get the variable by itself.

2
EX: x + 5 = – 13 subtract 5 from both sides – 5 – 5simplify x = – 18 EX: – 6 = x – 9 check add 9 to both sides + 9 +9simplify 3 = x check – 6 = 3 – 9 – 18 + 5 = – 13

3
EX: 7 – x = 42 subtract 7 from both sides – 7 – x = 35 we are solving for x not – x. +x +x 0 = 35 + x subtract 35 from both sides – 35 –35 add x to both sides – 35 = xcheck 7 – (– 35) =42 We could of solved – x = 35 by dividing both sides by –1

4
– 5x = 30 Divide both sides by – 5 – 5 x = – 6 check – 5 – 6 = 30 EX: solve The -5’s cancel Properties of Equality Multiplication property If a = b, then ac = bc Division property If a = b, and c ≠ 0, then a ÷ c = b ÷ c

5
EX: solve x = 32 – 4 Multiply both sides by – 4 (– 4) x –4 = 32 The -4’s cancel x = – 128 check – 128 – 4 = 32 (– 4) EX: solve 6 = – 2 — 3 x Multiply each side by – 3 — 2 Why 3 – — 2 ? The reciprocal of –2/3 is – 3/2 – 3 2 6 = – 2 3 – 3 2 x – 9 = x Check: - 2/3 –9 = 6

6
Practice: Solve each equation 1) –3x = 27 2) 3) – 3 – 3 X = –9 X= 40 X = 32

Similar presentations

© 2019 SlidePlayer.com Inc.

All rights reserved.

To make this website work, we log user data and share it with processors. To use this website, you must agree to our Privacy Policy, including cookie policy.

Ads by Google