u1: numbers
what does PEMDAS stand for?
parenthesees, exponents, multiplication & divison from left to right, addition & subtraction from left to right
5x + 10 = 15
solve for x
x = 1
what is the domain and range of a function?
domain is set of possible inputs to the function. range is the set of all possible outputs.
what are the 3 forms of linear equations?
slope-intercept: y = mx + b
point-slope: y1 - y = m(x1 - x)
standard: ax + by = c
solve the system by GRAPHING
y = 2x + 3
y = 4x + 7
graph :D
(-2, 1)
6 × (3 + 62 – 5) ÷ 5
evaluate the expression
40.8
3x + 5 = 5x + 10
solve for x
x = -5/2
what does an ordered pair (x,y) represent in a function?
it represents an input and output (input, output) of the function and a point on the graph.
y = -5/3x + 12
write an equation for a parallel line and a perpendicular line
y = 3/5x + ---
y = -5/3x + ---
solve the system by SUBSTITUTION
y = 3x - 1
3x + 6y = 2
(8/21, 1/7)
√128
simplify
8√2
4x + a + 3 = 3x + b - 5
solve for x
x = -8 - a + b
graph the function f(x) = 2x+5
who has the best graph?? :)
graph this line:
y = 6/7x - 3
graph :D
solve the equation by elimination
y = 2x + 4
y = x - 3
(-7, -10)
3^5 + 4^2
259
a taxi charges a flat rate of $12, plus an additional $4 per mile. write an equation to represent this situation
how much would it cost for someone to travel from SF to La? (~6 hrs)
y = 4x + 12
it would cost $36
80, 75, 70, 65, 60, ...
write the equation of the sequence, and then find the 50th term
an = 80 - 5(n-1)
50th term is -165
write the equation of the line that goes through the points (3,5) and (2,3)
y = 2x - 1
graph this:
y > 5x - 3
y < 2x + 4
graph :D
list all the perfect squares up to 100
1, 4, 9, 16, 25, 36, 49, 64, 81, 100
|2x+5|+3 = 9
solve for x
x = 1/2, -11/2
bob works a job and earns $5 every week. his salary increases by $1 every payment. how much does he have in 5 weeks?
an = 5 + 1(n-1)
a1 = 5 + 1(1-1) = 5
a2 = 6, a3 = 7, a4 = 8, a5 = 9
added = 5 + 6 + 7 + 8 + 9 = $35
find the slope and y-intercept
5x + 3y = 13
slope: -5/3
y-intercept: 13/3
what type of system is this?
y = 2x + 4
-6x + 3y = 12
consistent and dependent