need some help with SAT math

Test Preparation
1

<p>Ok</p>

<p>If x=yz, 1/2y=w, and z=4w, then in terms of x, what does w equal?</p>

<p>On the coordinate plane, Line LM passes through the origin. If line LM is perpendicular to line RS and they intersect at (5,3), where does line RS cross the x-axis?</p>

2

<p>.5y=w so y=2w
x = yz
x = 2wz
w= x/(2z)</p>

<p>unless I made a mistake somewhere, that should explain the first problem</p>

3

<p>For the second, slope of a perpendicular line is the negative reciprocal of the original line.
You can plug a point (5,3) and slope into the formula y=mx +b to solve for b and then solve for y=0 to find where it crosses the x-axis.</p>