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6.6 Equations

Test Review

TermDefinition
To determine if a value makes an equation true Substitute in the value, solve, see if equal True Ex. 6x = 108 if x = 18, 6(18) = 108, so yes False Ex. x-19 = 81 if x = 98, 98-19 = 70, so no
Solve 1-step equations Do the opposite operation to both sides to get x by itself (isolate)
To undo adddition subtract
To undo subtraction add
To undo muliplication divide
To undo division multiply
Solve 1-step equation with addition Subtract from both sides
Solve 1-step equation with subtraction Add to both sides
Solve 1-step equation with multiplication (a number next to a letter or coefficient) Divide both sides
Solve 1-step equation with division (remember, a fraction is a division problem!) Multiply both sides
Independent Variable x-axis, not affected by dependent variable Ex. number of people, time
Dependent Variable y-axis, depends on the independent variable Ex. cost, test scores
Graphing inequalities 1. arrow less than= left, greater than = right 2. circle or equal to= filled in, not or equal to= open
at least, minimum inequality greater than or equal to
at most, maximum inequality less than or equal to
combine like terms Add or subtract terms that have the same variable and exponent
Write and solve an equation from a word problem 1. Define the variable- let x = __________ 2. Write an equation based on the word problem 3. Solve the equation 4. Check that your answer made sense
Popular Math sets

 



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