5. Literal Equations and Formulas
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Isolate y on the left-hand side of the equation, then substitute the values for x.
Equation: y=4-2x
| x | y |
|---|---|
| - 2 | 8 |
| 1 | 2 |
| 3 | - 2 |
Let's begin by solving the equation for y.
LHS-4x=RHS-4x
Subtract terms
.LHS /2.=.RHS /2.
Factor out 2
a/b=.a /2./.b /2.
To find the value of y for each of the x-values, we substitute them into the equation and evaluate.
| x | 4-2x | y |
|---|---|---|
| - 2 | 4-2( - 2) | 8 |
| 1 | 4-2* 1 | 2 |
| 3 | 4-2* 3 | - 2 |