Equations
What is the equation for slope-intercept form?
How do I find the slope from two points?
y 2 - y1 / x2 - x1
What do parallel lines have in common?
Same slope
y = (0.25)x
Decay
Equation of a line parallel to x = 3
x = 4 x = 5...
What is the standard form of the equation of a line?
ax + by = c
Find the x intercept of y = 4x - 7
Substitute 0 for y and solve
(7/4, 0)
What do perpendicular lines have in common?
Opposite reciprocal slopes
y = 3x
Growth
What does the equation of a vertical line start with?
x=
What is the standard form for quadratic equations?
ax2 + bx + c
Find the roots of a quadratic equation?
- Factor the equation
- Set the equation equal to zero and find the intersection point in the calculator
What is the slope from the equation below?
3x + 4y = 7
m = -3/4
y = (3/2) x
Growth
What is the slope of a vertical line?
Undefined
What is the explicit formula of an equation?
d(n-1) + a1
Set up growth and decay equations that have percentages in the problem?
Turn percentage to decimal
Growth- add to 1
Decay- Subtract from 1
When a data set has an outlier, which is a greater measure of center? Mean or Median?
Median
y = (1/3) x
Decay
What are the four words to describe solutions for factoring?
Solutions, roots, x-intercepts, factors
What is the equation to find the Axis of Symmetry?
x = -b/2a
How do I find the line of best fit and use it to predict?
Stat, calc, linear regression
Go to y= screen, vars, stats, eq
Go to table to predict
What would be a perpendicular slope to the line below?
3x + y = 7
m = 1/3
5(.5)2
Decay
What do you have to do to x2 + 7x -4 = 3x + 2 before you can solve it?
Combine like terms and set it equal to zero