What about it? Do you have a question? The graph of y= 40x+ 50 is a straight line with slope 40. When x= 0, y= 50 so the y-intercept is 500- the line goes through (0, 50). When x= 1, y= 40+ 50= 90 so the line goes through (1, 90). Those two points determine the line.
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