How do you find the equation of a straight line on a graph?
Firstly you need to find the gradient and to do this you identify two points on the graph and the gradient is the change in the value of the y values divided by the change in the value of the x values. (y2-y1)/(x2-x1).
Then to find your 'c' value for the y=mx+c (straight line equation where m=gradient), you either sub in a your x and y values for one point as well as your gradient and find the missing number or you identify where the curve cuts the y axis. At this point you will have your equation of the straight line.
OJ
Related Maths GCSE answers
All answers ▸If there are 20 marbles in a bag and 1/5 are red, what fraction are red if 1 more red marble is added?
Here are three expressions. b/a, a – b, and ab. When a = 2 and b = -6, which expression has the smallest value?
Solve: x^2 – x – 12 = 0
A square is placed in a circle of area (49π)cm^2 such that all four vertices of the square lie on the circumference of the circle. What is the area of the square?