If 3x – 10 = 17, what is the value of 6x + 20 ?

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asked Jan 17, 2015 180k views

2 votes

If 3x – 10 = 17, what is the value of 6x + 20 ?

Mathematics
high-school

ZKS asked

by ZKS

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74 because 3x equal 17+10. so x equals 9 and plug it in to the equation got 74

WVrock answered Jan 19, 2015

by WVrock

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$3x-10=17\ \ \ \ /+10\\\\3x-10+10=17+10\\\\3x=27\ \ \ \ /:3\\\\3x:3=27:3\\\\x=9\\\\\\\\6x+20=6\cdot9+20=54+20=74$

$3x-10=17\ \ \ /\cdot2\\\\2\cdot3x-2\cdot10=2\cdot17\\\\6x-20=34\ \ \ \ /+40\\\\6x-20+40=34+40\\\\6x+20=74$

Milan Shukla answered Jan 20, 2015

by Milan Shukla

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