Day 79 and 80 – January 4, 5

Algebra 1a: Chapter 4, Lesson 4, page 183.

Using the Properties Together

Inequalities of 2 steps
We do the same, again, as equalities and solve by:

  • Distributing when required
  • Combining like terms
  • Adding or subtracting terms to isolate variables and numbers (constants)
  • Multiplying or dividing to finish solving for the variable, remembering to reverse the sign of the inequality IF we multiply or divide by a NEGATIVE NUMBER.

For example:

`7x + 4 ≤ 4x + 16`

subtract `4x` from both sides, that looks like

`7x – 4x + 4 ≤ 4x – 4x + 16`

now combine like terms on the left and the right sides

`3x + 4 ≤ 16`

subtract 4 from each side

`3x + 4 – 4 ≤ 16 – 4`

combine like terms again on both sides, so that

`3x ≤ 12`

and finally divide both sides by 3

`(3x)/3 ≤ 12/3`, so that finally

`x ≤ 4`

Go slow and show all the steps! Here are some more examples from purplemath.com

Two of tonight’s homework problems solved by MrE are here! Just click it!

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