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# Module 4

### Variation and Problem Solvong

Tips- (DIRECT VARIATION)When substituting into the proportionality equation, remember to always stay consistent.
Tips- Do not confuse direct variation with inverse variation.
Step 1- write down equation y=kx
Step 2- Substitute the values of each variable into the equation
Step 3- Divide both sides of the equation x to solve for k
Step 4- Rewrite the direct variation equation using the value of the proportionality constant.
Step 5- substitute the value given in the second part of the problem into the new equation
Step 6- perform the indicated computations .
Tips- (INVERSE VARIATION)- remember as one increases the other decreases, or vice versa.
Step 1- analyze your data
Step 2- Express known and unknown values in an inverse variation equation
Step 3- plug in the value for "k" and solve for "F"
Tips- (JOINT VARIATION) remember that constant variation is a number that relates to how the value of one mathematical variable changes as another mathematical variable increases.
step 1- read the question being given carefully, noting which variables vary directly with which other variables
step 2- calculate the constant of variation by dividing the dependent variable by the independent variable.
step 3- finish solving the constant of variation problem
Read section 8.4 in Pearson for additional help
Created by: jasmincarlton