According to Nasa, when the International Space Station (ISS) is at an altitude of 385 kilometers, it travels at about 17,178 mi
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Given the slope m and a point (a,b) of a line, its equation is given by
In your case, a = -4, b = 7 and m=1/2, so we have
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It isn't necessary but having a positive coefficient for makes things like completing the square and factoring easier.