Question

Please help!!!! again

1) A friend is training for a marathon.She can run 4 miles in 28 minutes.Assume that she runs at a constant rate. Write an equation to represent,y,your friend can run in x minutes.
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Answer 1

`(y\ miles)/(x\ minutes)=(4\ miles)/(28\ minutes)\ \ |cross\ multiply\\\\28y=4x\ \ \ \ |divide\ both\ sides\ by\ 28\\\\\boxed{y=(4)/(28)x\Rightarrow y=(1)/(7)x}`