<p>it was 2^-x + 2^y = 2^3</p>
<p>therefore, it was (3,6) as the only combo that worked.</p>
<p>it was 2^-x * 2^y = 8</p>
<p>It was * (multiplication)</p>
<p>Btw irishblues:</p>
<p>2^-3 * 2^6 = 2^3 = 8</p>
<p>But you know that -x+y=3 and if you plug that in then
-(-3)+6=3
9!=3</p>
<p>well then three works too as 2^0 * 2^3 =8</p>
<p>You can't use 0 because the problem said that x and y were positive integers. I'm pretty positive that 3 and 8 were impossible to get. Only 18 (or III) worked.</p>
<p>yes but 5*8 = 40, which was not an answer choice</p>
<p>Does anyone remember it mentioning that that it was positive? I really forget those minuscule stuff. If it didnt say anything like that then 3 works. For the people cheerleading for III (18). Care to post the actual x and y values that would give those results?</p>
<p>x = 3 and y = 6</p>
<p>xy = 18</p>
<p>2^{-3}*2^{6} = 2^3 = 8. Happy SAT day. haha.</p>
<p>Almost certain it said positive integers. For 18 to work use 6 and 3.</p>
<p>3 and 6 for the two factors. -x + y = 3.</p>
<p>what was the answer to the area of the trapezoid question on the grid in??? and what about the question with the f(x) passes through the point 1, 5 .. what point will the f(x-1) pass through ???</p>
<p>for the f(x) and f(x-1) the answer was (3,5).</p>
<p>yea..it was between (3,5) and (2,4), but the 2,4 one wouldnt have made it a function so (3,5) is the correct answer</p>
<p>grayfalcon -</p>
<p>Alright so you said x=3 and y=6</p>
<p>In order for that to work they have to pass this two tests:
y-x=3 or -x+y=3 --> same thing
-xy=18</p>
<p>x=3 and y=6 pass the first but not the second. Remember that it said -xy and not xy.</p>
<p>What did you guys get for that grid in with the two equal containers one?</p>
<p>Acere: I thought they wanted the product of xy and NOT -xy.</p>
<p>It was -xy.</p>
<p>no it was xy</p>
<p>equal containers - it was 6000</p>
<p>Thanks, spiffystars!</p>
<p>Acere: if it was -xy none of them would work, ne?</p>
<p>can someone who got (3,5) explain that, because i got (2,4)</p>
<p>f(x) = (3,5) so y = (x + 2)</p>
<p>f (x - 1) so y = ((x-1)+2) so it was (2,4)</p>
<p>that's how i did it</p>