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how do I solve this?

label Algebra
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Oct 19th, 2017

Since this is a linear function, you have to figure out the slope and the y-intercept.  The y-intercept is easy.  It's the place where the line crosses the y-axis.  that's at y = 25.  To find the slope, you need to find change in y divided by change in x.  You can see at that x = 0, the line is at (0, 25).  At x = 20, the line is at (20, 30).  Therefore, the slope is (30-25)/(20-0) = (5/20) = 1/4. 

Therefore, the function is y = (1/4)x + 25.

Nov 9th, 2014

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