Math Question

Test Preparation SAT Preparation
1

<p>If y=(5x^3)/z, what is the value of y when X and Y are doubled?</p>

<p>I keep on saying that the value of y doesn’t change because if you multiply the top and bottom by two its like mutiplying the equation by 2/2 which is one making the value of y unchanging… what am i doing wrong and what is the answer?</p>

<p>Choices:
a. y is not changed
b. y is halved
c. y is doubled
d. y is tripled
e. y is multiplied by four</p>

2

<p>Answer is E. </p>

<p>Keep in mind that x is cubed. When you double a cubed value, it becomes more than double (2x)^3 to be exact. Work it from here and then solve for y. You ll see that the y you get is 4 times the original value. Good luck ;)</p>