EXPRESSIONS, EQUATIONS, AND FUNCTIONS
What is the value of 6n+7 when n=2?
What is 19.
What is the square root of 9?
What is 3.
Identify the slope and y-intercept: y=-2x+6
What is m=-2;b=6
What is the equation of a line that has a y-intercept of 5 and has slope 2.
Hint: Think of slope-intercept form.
What is y=2x+5
Solve the linear system:
x+y=4
x-y=8
What is x=6, y=-2 or (6,-2)
Create an expression which represents "The difference of a number m and 15 is equal to 30".
What is m-15=30.
Simplify: -x(x-10)
What is -x^2+10x.
Identify the slope and y-intercept of: -10x+5y=-20
What is the equation of a line that has a y-intercept of -10 and has slope of 1?
Hint: Think of slope-intercept form.
What is y=x-10
Solve the linear system:
2x+5y=10
2x+y=2
What is x=0, y=2 or (0,2)
Is x=8 a solution to the inequality 2x+10<4x-7 ?
2(8)+10<4(8)-7
16+10<32-7
26<25
What is no 26<25 is not true!
True or False: Subtracting a negative number means the same thing as adding.
What is True.
Solve for x: 16x-4=8x+12
What is x=2.
What is slope intercept form?
What is y=mx+b.
Is the ordered pair a solution to the linear system? (0,-5)
5x-4y=20
3y=2x+1
What is No.
5(0)-4(-5)=20 -> 0 - (-20) = 20 which is true.
3(-5)=2(0)+1 -> -15=0 + 1 which is not true.
You buy x apples at $2 per pound and y oranges at $3.50 per pound. What is an expression for the total cost, c, of the fruit purchased?
What is 2x+3.50y=c
An elevator moves at a rate of -10 feet per second from a height of 500 feet above ground. It takes 6 seconds for the elevator to make its first stop. How many feet about the ground is the elevator now?
500 - 10 - 10 - 10 - 10 - 10 - 10 = 440.
What is 440 feet.
Solve for x: x/8+10=15
What is x=40.
What is point slope form?
What is y-y1=m(x-x1)
What is elimination, substitution, or graphing.
A rectangular banner is 16 feet long and 5 feet wide. What is the perimeter of the banner?
16 + 16 + 5 + 5 = 42
What is 42 feet.
What is -16 - (-20)?
What is 4.
What is false.
What is the equation of a line in point slope form which passes through the point (4,5) and has a slope of 2?
What is y-5=2(x-4)
True or False: Solutions of systems of equations are the coordinate pairs in which their graphs intersect with one another.
What is true.