Both the SAT & ACT Math sections involve the manipulation of equations and solving linear systems.

Percent change formula
[(new-old)/old]*100

When you raise an exponent to another power you multiply the 2 exponents
When you multiply the bases you add the exponents
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For linear functions start with slope.
Solve for slope then set up y=mx+b. Then solve b
Then answer question

To find x int set y=0
To find y int set x=0