go to x = 0 and look for where the line crosses the y axis.
ADDED: That answers the question as it is, but it's worth pointing out you can also calculate it without plotting it, because the y-intercept is given by making x = 0 in the particular equation.
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m=24*(1.135)*1
You can either measure or estimate the coordinates visually from the graph, or solve the equation underlying the graph.
12
Select any value for one of the variables in the graph and solve the equation to get the other variable.
y = - x2 +6x - 5.5