Equations and Functions

What is the definition of function?

• Has inputs and outputs
• Every input has only ONE output
• Inputs have different outputs every time
• x-values and y-values

What is the first step to solve this equation:
11 - 3x = 44

• Add 3 to both sides
• Subtract 11 from both sides
• Add 11 to both sides
• Divide 3 on both sides.

d + 3 = 8

d = ?

• d = 3

• d = 8

• d = 5

• d = 11

2x+3=x-7

• x=5
• x=-4
• x=1
• x=-10

 $-118=-5\left(4+7x\right)+7$  

•  $-5$  

•  $-9$  

•  $3$  

•  $-1$  

Solve for n:
2m - n = 8

• n = 2m - 8
• n = -2m - 8
• n = 2m + 8
• n = -2m + 8

A-B = C
(solve for A) 

• A = C - B
• A = C + B
• A - C = B
• B = A - C

W = A/L
 (solve for A) 

• A = W/L
• A = LW
• A = W + L
• A = W - L

• 9

• 13

• 21

• -9

Is this mapping a function or not a function? 

• Function
• Not a Function