PLEASE show step by step with explanations
1/7-1/y
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7-y
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7
1/7-1/y
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7-y
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7
-
= [(y - 7)/7y]/[(7 - y)/7 ==> LCD in top fraction
= [(y-7)/7y][7/(7-y)] ==> Invert and multiply
= -1/y ==> Cancel the 7's and factor -1 out of the 7 - y in the denominator making it y - 7 and cancel the y - 7 from numerator and denominator. That leaves - 1/y
Hope that helps!
= [(y-7)/7y][7/(7-y)] ==> Invert and multiply
= -1/y ==> Cancel the 7's and factor -1 out of the 7 - y in the denominator making it y - 7 and cancel the y - 7 from numerator and denominator. That leaves - 1/y
Hope that helps!