The 420 $ selling price of a television is $30 less than 3 times the cost. Find the cost .
2007-12-05 10:07:32 · 3 answers · asked by Anonymous in Education & Reference ➔ Words & Wordplay
$420= 3x-$30 use x to represent the cost
$30 + $420= 3x - $30 + $30 you add $30 to each side in order to get the 3x by itself to solve for x (what you do to one side of the equation you must do to both).
$450=3x now divide by 3 to get the x by itself.
$150= x after dividing by 3 on both sides you get x= $150
The cost of the television is $150
2007-12-05 10:20:54 · answer #1 · answered by crazeeeecindy 3 · 0⤊ 0⤋
It's 30 dollars less, so
420-30=390
It is then 3 times the amount minus 30, so
390/3=130
The TV costs $130.00
(I explained it for you, so you actually get how to do it, rather than just mooch answers off people without knowing how to do it)
2007-12-05 10:21:30 · answer #2 · answered by bizarotiger 2 · 0⤊ 0⤋
The cost is $150.
Formula: 3C + 30 = $420
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Bruce
2007-12-05 10:13:00 · answer #3 · answered by Bruce 7 · 0⤊ 1⤋