Math Help from BB

Test Preparation SAT Preparation
1

<p>This is from the #3 test section 2 math on BB1. </p>

<p>I only missed this problem and even though I stared at it for thirty minutes I couldn't figure out a way how to solve this. (I HATE graphing problems or anything relating to graphs).</p>

<p>Question: In the xy-planee, line L passes through the origin and is perpendicular to the line 4x + y = k, where k is constant. If the two liens intersect at the point (t, t + 1), what is the value of t?</p>

<p>Answer choices:
A. -4/3
B. -5/4
C. 3/4
D. 5/4
E. 4/3</p>

<p>The answer is A. Says it was medium in difficulty. So how do you solve this? Any method that is fast, logical, and effective is good enough for me.</p>

2

<p>-4x = Slope.</p>

<p>Perpendicular reciprocal: 1/4</p>

<p>Passes through the origin: k = 0 (k is y-intercept)</p>

<p>x-4y=k is y=1/4x+k (another form)</p>

<p>Substitute x with t and y with t+1 in the equation y=x/4</p>

<p>t+1=t/4 … 4t+4=t … 3t=-4 … t=-4/3</p>

3

<p>Oh I see ok thank you!</p>