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OpenStudy (anonymous):
if y is proportional to 2x-7,and y=-9 when x=2,find x when y=-15.Please show me step by step
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OpenStudy (lgbasallote):
proportional which means... y = k(2x-7) -9 = k(2(2) - 7) -9 = k(4 - 7) -9 = k(-3) -9 = -3k divide both sides by -3.... 3 = k when y = -15... -15 = (3)(2x-7) -15 = 6x - 21 21 - 15 = 6x 6 = 6x divide both sides by 6... 1 = x
OpenStudy (lgbasallote):
k is the proportionality constant
OpenStudy (anonymous):
Thank you so much
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