CHAPTER 6 / WHAT THE SAT MATH IS REALLYTESTING 249
Concept Review 4:Simplifying Problems
Simplify the following expressions.
- − 2 n−(6 − 5 n) −n
2.
3.
4.
5.
Solve the following problems with substitution.
- If y= 1 −xand 2y+x=5, then what is the value of x?
- If 3 +m+n=n^2 +m^2 , what is the value of?
- For all real numbers x,let
=(1 −x)^2. What is the value of <<4>>?
nnmm^22
6
()− +−()
xx^6
6410
2
xx x^32
x
++
21
x 2
+
218
23
2
2
x
xx