GMAT Factoring: If x=k c and y=k t, then y-x=
Question
If x=k c and y=k t, then y-x=
- k(t-c)
- k(c-t)
- c(k-t)
- t(k-c)
- k(1-t)
Topics: factoring, expression formulas, simultaneous equations
Solution
Step 1
Substitute the given expressions for x and y into the difference y - x.
y - x = kt - kc
Step 2
Factor out the common factor k from the two terms.
kt - kc = k (t - c)
Answer
k(t-c) (A)
