Applying Linear Functions and Algebraic Techniques
This page focuses on practical applications of linear functions and algebraic techniques, including calculating function values, determining parameters, and finding antecedents.
Calculating Function Values:
For the function Px = 3x + 2, we can calculate P−1:
P−1 = 3−1 + 2 = -3 + 2 = -1
Determining Function Parameters:
Given Px = 5x + p and P−2 = 3, we can find p:
5−2 + p = 3
-10 + p = 3
p = 13
Therefore, Px = 5x + 13
Example: For the function Px = mx - 3, if P4 = 12, we can determine m:
mx4 - 3 = 12
4m = 15
m = 15/4 = 3.75
Thus, Px = 3.75x - 3
Finding Antecedents:
To find the antecedent of -1 for fx = -1/5x + 2:
-1/5x + 2 = -1
-1/5x = -3
x = 15
Highlight: The antecedent is the input value x that produces a specific output value for a given function.
Determining a Linear Function from Two Points:
To find the function fx such that f−6 = 5 and f3 = -1:
m = f(3 - f−6) / 3−(−6) = −1−5 / 9 = -2/3
Using the point-slope form: fx = -2/3x + b
Substituting f−6 = 5: 5 = -2/3−6 + b
5 = 4 + b
b = 1
Therefore, fx = -2/3x + 1
Vocabulary: The slope formula used here is y2−y1 / x2−x1, where x1,y1 and x2,y2 are two points on the line.
The page concludes with additional calculations and formulas related to linear functions and slopes, reinforcing the practical application of these factorisation formule and development techniques in solving algebraic problems.