Vocabulary
What is a variable?
A letter or symbol that represents an unknown value.
Identify the variable: 5x+8
x
What is domain?
All possible input values.
Evaluate x+4 when x=3
7
A number is 7 more than twice another number. Write an expression.
2x+7
What is the difference between an expression and an equation?
An equation contains an equal sign
Translate: "The quotient of a number and 4 increased by 2."
n/4+2
A graph models the height of a plant over time. Which variable is the domain?
Time
Evaluate 2x+3y when x=5 and y=2
9
What is the mean of 4, 6, 8?
6
A mathematical statement showing two expressions are equal.
What is an Equation?
A student writes 5+2x for "five more than twice a number."
Is the student correct?
Yes
What is slope?
The rate of change
Evaluate : 4m-2n+7 when m=8 and n=5
29
A graph is horizontal. What type of function is it?
Constant
The average of a data set.
What is the Mean?
"The total cost of nnn movie tickets costing $12 each plus a $5 service fee."
12n+5
Write the slope-intercept form of a linear equation.
y=mx+b
A bakery charges $3 per cookie. Write an expression for the cost of c cookies.
If the bakery sells 183 cookies, how much money did they earn?
Expression:3c
Money earned $549
Evaluate: 6ā2(4)
A student gets 16.
What was the mistake?
They added instead of multiplying first.
The process of getting the variable alone on one side of an equation.
What is Isolating a Variable
Translate the expression 4nā12 into words.
Four times a number minus twelve.
Why might an outlier affect the accuracy of a regression model?
It can distort the slope and y-intercept, leading to less accurate predictions
Two students interpret 4(x+3).
Student A: "Multiply 4 and x, then add 3."
Student B: "Add 3 to x, then multiply by 4."
Who is correct?
Student B
A student claims: "The expression 5n5n5n means add 5 and n."
Agree or disagree?
Disagree. It means 5 multiplied by n.