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作文地带导读：By subtracting the second equation from the first:　　Some test-takers might have seen this problem and been tempted to immediately start trying to solve for x and y individually.The question asks you to solve for y, which mea...

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作文地带导读：The difference between the distance traveled by Jim and the distance traveled by Ryan is 2h 4 – .75h 4 = 1.25h 4 miles.The halfway point between the stations is 255 2 = 127.5 miles from either station, so it happened 135 – 1...

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作文地带导读：This is why there are always two solutions to absolute value problems (unless the variable is equal to 0).　　Here is one more example:Solve for x in terms of y in the equation 3= y2 – 1.　　First, isolate the expression with...

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