Carcass wrote:
2x≠y
5x≠4y
What is the value of 5x−4y2x−y3yy−2x+5 ?
A. 12
B. 32
C. 52
D. 72
E. 92
When we check the answer choices (ALWAYS check the answer choices before deciding on an approach!), we see that none of the answer choices include the variables x and y.
This tells us that all of the variables must cancel out.
Given this, let's assign some values to x and y, and then evaluate the given expression to see what we get.
If
x=1, and
y=0, we get:
5x−4y2x−y3yy−2x+5=5(1)−4(0)2(1)−(0)3(0)(0)−2(1)+5 =(52)0−2+5=(52)5=12Answer: A
Cheers,
Brent