Algebra: Chapter 3-7, page 142.
Formulas
Formulas that use more than 1 letter are often called literal equation. Use the formula and solve for the desired variable by treating all other variables as if they are constants or coefficients. Constants are separated by `+` and `−` symbols whereas coefficients are like `2x`, the `2` is a coefficient.
Just solve these like any other equation using the strategies from yesterday
- Multiply both sides to clear fractions or decimals, if necessary.
- Collect like terms on each side, if necessary.
- Use the addition property to move the variable to one side and all other terms to the other side of the equation.
- Collect like terms again, if necessary.
- Use the multiplication property to solve for the variable.
Two of tonight’s homework problems solved by MrE are here! Just click it!
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Algebra 1a: Chapter 2, Lesson 4, page 71.
Subtraction of Rational Numbers
Today, we are working on subtraction of rational numbers. Remember, just do the inverse of subtraction and ADD the inverse (or opposite) of the number to the other number.
Examples:
`2-6 = 2 + (-6) = -4`
`-5 – 7` is really `-5 + (-7)`, remembering that the + sign is invisible. So this becomes just `-5 + (-7)` and remembering the adding rule of 2 negatives, the answer becomes `-12`.
`-4 – (-5)` is really `-4 + 5` because 2 negative are a positive (bling-bling or make change-change from Ms. Phillips and Ms. Craig) and the answer is `+5 – 4` and the final answer is `+1`!
Two of tonight’s homework problems solved by MrE are here! Just click it!
Purplemath.com has these tutorials for the addition and subtraction of rational numbers too!