1.
If you use the elimination method to solve the system of equations
3
x
- 4
y
= 9 and 2
x
+ 3
y
= 7, which of the following would be the best method?
Method I: Multiply both sides of the first equation by 2, and multiply both sides of the second equation by 3. Then add the two equations.
Method II: Multiply both sides of the first equation by 3, and multiply both sides of the second equation by 4. Then add the two equations.
A.
Method I
B.
Neither Method I nor Method II is correct.
C.
Method II
D.
Both Method I and Method II are correct.
Hint
2.
The cost of producing an item is $5 per item plus an initial cost of $2000. The selling price is $10 per item. Find the break-even point.
A.
450 items
B.
4500 items
C.
400 items
D.
4000 items
Hint
3.
Which of the following describes the system of equations 2
x
-
y
+ 4 = 0 and 4
x
- 2
y
+ 7 = 0?
A.
inconsistent
B.
consistent and independent
C.
none of these
D.
consistent and dependent
Hint
4.
Solve the system of equations
y
= 0.5
x
and 4
y
=
x
- 2 by graphing.
A.
B.
C.
D.
Hint
5.
Choose the best method to solve the system of equations 4
x
+
y
= 6
and 2
x
-
y
= 10.
A.
Eliminate
y
B.
Substitution
C.
Graphing
D.
Eliminate
x
Hint