Straight line graphs 1

Line graphs

• Here are two things you need to know about straight line graphs
• If an equation is in the form y =mx + c, its graph will be a straight line
• Use a table of values to draw a graph

Finding equations

• If you have a graph you can found its equation by working out the gradient and looking at the y-intercept
• Put your values for gradient, m, and y -intercept,c, into the equation of a straight line y=mx + c

Working in out

• You can rearrange the equation of this graph into the form y=mx+c so it is a straight line
• The gradient is a and the y-intercept is at()
• You could use this information to draw the graph, but its safer to make a table of values
• Make sure you plot at least three points, then join them with a straight line using a ruler