math review

Question 1

what is the equation of a line

Answer 1

y= alpha + betax
alpha= vertical intercept
beta= slope (slope =rise/run)

Question 2

positive relationship between variables

Answer 2

-graph slope is upward and is greater than 0 this is a DIRECT relationship

Question 3

negative relationship between variables

Answer 3

• downward slope and the slope is less than zero this is an INVERSE relationship
  ex: decrease price, increases the amount of buyers

Question 4

no relationship between variables

Answer 4

horizontal slope, y value is constant and the slope is 0
or
vertical slope, x value is constant and the slope is undefined , ex: no matter price of medication people will still buy it

Question 5

intersection between two lines

Answer 5

1. solve both equations for y
2. set equations to equal each other then solve for x
3. sub x value back into either equation and solve for y this will give you the y. x value of the graph where it intersects