The direct attribute is renowned in business economics. It is attrenergetic because it is basic and easy to manage mathematically. It has many vital applications.

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Liclose to features are those whose graph is a straight line.

A straight attribute has actually the adhering to form

y = f(x) = a + bx

A direct feature has actually one independent variable and also one dependent variable. The independent variable is x and the dependent variable is y.

a is the consistent term or the y intercept. It is the value of the dependent variable when x = 0.

b is the coreliable of the independent variable. It is also known as the slope and also provides the price of change of the dependent variable.

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**Graphing a linear function**

To graph a direct function:

1. Find 2 points which satisfy the equation

2. Plot them

3. Connect the points with a straight line

**Example: **

y = 25 + 5x

let x = 1 then y = 25 + 5(1) = 30

let x = 3 then y = 25 + 5(3) = 40

**A easy example of a direct equation**

A agency has actually solved costs of $7,000 for plant and equuipment and variable prices of $600 for each unit of output. What is complete price at varying levels of output?

let x = systems of output let C = complete cost

C = fixed cost plus variable cost = 7,000 + 600 x

output | full cost |

15 systems | C = 7,000 + 15(600) = 16,000 |

30 units | C = 7,000 + 30(600) = 25,000 |

**Combinations of direct equations**

Linear equations deserve to be added together, multiplied or split.

**A straightforward example of enhancement of straight equations**

C(x) is a price function

C(x) = addressed price + variable cost

R(x) is a revenue function

R(x) = marketing price (variety of items sold)

profit equates to revenue much less cost

P(x) is a profit function

P(x) = R(x) - C(x)

x = the number of items produced and sold

**Data:**

A agency receives $45 for each unit of output sold. It has a variable cost of $25 per item and also a solved expense of $1600. What is its profit if it sells (a) 75 items, (b)150 items, and also (c) 200 items?

R(x) = 45x | C(x) = 1600 + 25x |

P(x) = 45x -(1600 + 25x) | |

= 20x - 1600 |

let x = 75 | P(75) = 20(75) - 1600 = -100 a loss |

let x = 150 | P(150) = 20(150) - 1600 = 1400 |

let x = 200 | P(200) = 20(200) - 1600 = 2400 |