Rewrite y=4-2x in slope-intercept form.
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Ok so, Since Kelli and her family drove a total of 293 miles in 7 hours, then your equation should be 
Now, since you have your ratio you divide 293 by 7 in order to get how many miles were driven in one hour
= 41.85714286 miles/hr
Now, since you have your ratio you divide 293 by 7 in order to get how many miles were driven in one hour