Solve the equation for "y". In this case, you'll have an equation of the form:
y = ax + b
In this type of equation, whatever number you have instead of "a" is the slope; and whatever number you have instead of "b" is the y-intercept.
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A straight line through the points (0, 1) and (-0.4, 0).
It is a straight line through the origin with slope of 5. So start at (0,0) and go up 5 and over 1 to find the next point. Join those two points with a line and you can see the graph.
Since no points were given, for any point (x,y), plug the x and y values of the point into the equation. If you get a contradiction, ie 5=3 or something similar, then the point does not lie on the graph.
5x+10=40 5x+10-10=40-10 5x=30 5x/5=30/5 x=6