All Functions, All Review

All Functions, All Review

Terms to Know Function: a mathematical relationship between two variables. A change in one variable affects the other one.

5 8

x+3 y = ????

SLOPE: this is a measurement of how steep a line is. It is represented with the letter m.

difference in Y m= difference in X

8 3

…it shows how

much “Y” changes when “X” changes!

m=

3 8

Y – Intercept: this is the point where the line hits the Y Axis on a graph. The “x” coordinate will ALWAYS be zero at this point. (0,5) …it is represented with the letter b

b=5

(0,-5)

b = -5

(0,-2)

b = -2

Function Formula: a math sentence that shows the relationship between X and Y.

For every rock I get 2 dollars!

d = 2r

Trog start out with 10 dollars. Then get ½ dollar for every shell I find.

d = ½ s + 10 how much money Trog gets in dollars

Trog have tricky one… Trog have 5 dollar. I don’t make any money no matter how many shell I find.

d = 0s + 5 Dude, really?

Slope-Intercept Form: this is a function formula that involves the slope and the yintercept along with the two variables.

y = mx + b slope

y intercept

Point-Slope Form: this is a function formula that involves the slope and any point on the line it represents, along with the two variables. slope

y – y1 = m(x – x1) ANY POINT

To get the Slope-Intercept Form, just solve for y and simplify!