<p>"if twice as many $1 light bulbs as $2 light bulbs"</p>
<p>doesnt that mean for every 2$ light bulb bought, 2 $1 light bulbs are bought? if not, can someone explain why? this problem was in the blue book and it got it wrong because i put 2x=y, when its supposed to be x=2y.</p>
<p>wait can u write the WHOLE question please?
(dont need choices)
but uhh lemme try to explain without it....if u let x be the 1$ light bulbs and y be the 2$ light bulbs then x=2y
because lets say for example u bought 12 1$ light bulbs ..and 6 2$ light bulbs (because u bought twice as much 1 dollar ones) then to make them 'match' (be an equal number) u would have to double the small one , (y) not double the one thats ALREADY bigger (X; number of 1$ light bulbs) so x=2y....
(12)=2(6).....</p>
<p>""if twice as many $1 light bulbs as $2 light bulbs"</p>
<p>doesnt that mean for every 2$ light bulb bought, 2 $1 light bulbs are bought?"</p>
<p>Yes, that's what it means. It depends on what x and y refer to... if you let x equal the number of $1 bulbs, and y equal the number of $2 bulbs, then x=2y, because you need x to be twice as large as y.</p>
<p>A school ordered $600 worth of lightbulbs. Some of the light bulbs cost $1 each and the others cost $2 each. I got the equation x+2y=600 x=$1, y=$2
If twice as many $1 bulbs as $2 bulbs were ordered, (i got 2x=y) how many lightbulbs were ordered all together?</p>
<p>So i plugged in 2x into the equation and got, x+4x=600 x=120. Then I subtracted 120 from 600 and divided by 2 and got y=240. I then added 120+240 and got 360 but that wasn't the right answer. It was 450. </p>
<p>In here, <a href="http://talk.collegeconfidential.com/showpost.php?p=1470329&postcount=42%5B/url%5D">http://talk.collegeconfidential.com/showpost.php?p=1470329&postcount=42</a></p>
<p>he says, Secondary equation: "If twice as many $1 bulbs as $2 bulbs were ordered..." means 2y = x.</p>
<p>So I'm confused why 2y=x and why it isn't x=2y.</p>
<p>It's 2y=x because there half as many y($2) as there are x($1). The number of $2 light bulbs, y, multiplied by 2, is the number of $1 light bulbs, x. I hope that helped.</p>