Algebra – Linear Functions By the end of this lesson you will be able to identify and calculate the following: 1. Finding the equation of a straight line.

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Algebra – Linear Functions By the end of this lesson you will be able to identify and calculate the following: 1. Finding the equation of a straight line from its graph

 Finding the equation of a straight line from its graph  To find the equation of a straight line from the graph:  1. draw a gradient triangle and find the value of the gradient, m  2. read off the y-intercept, c  3. substitute the values of m and c into the general equation y = mx + c.

 Your turn…  Complete - Questions all - Work Sheet 6.1 (teacher to hand out) All questions are to be answered in your math book!

1. Use two methods we have learned in class to find the gradient of this line.

2. Write the equation of a linear graph explaining what each term(letter) means. 3. Find the gradient and y-intercept of the lines for a) y= 4x + 8 b) 8x – 2y = Find the gradient of the line passing through (-4, -7) and (1,-1)