CPT Review 4/17/01
16
28. D
Given the equation –2x + 3y = 12, find the missing value in the
ordered pair (–3,___).
Substitute the “-3” into the equation for x and solve for y.
2
6
3
12
3
6
12
3
)
3
(
2
12
3
2
=
=
=
+
=
+
−
−
=
+
−
y
y
y
y
y
x
29. C
The x-axis is the horizontal axis. The line intersects the x-axis at
(
)
0
,
2
−
.
30. C
Using the intercept method to graph a line, substitute “0” in for the x value
and solve for y. Then substitute “0” in for the y value and solve for x. Then
plot these point and draw the line.
( )
( )
0
,
2
and
6
,
0
are
intercepts
2
x
6
6
3x
6
0
6
0
3x
6
)
0
(
3
=
=
=
=
+
=
+
=
+
y
y
y
31. C
Solve and simplify if possible:
3
9
3
2
−
−
−
x
x
x
(
)(
)
3
3
3
3
3
9
3
9
3
2
2
+
=
−
−
+
=
−
−
=
−
−
−
x
x
x
x
x
x
x
x
x
32. A
Solve the following system of equations for the y-value:
13
2
2
7
2
=
+
=
+
y
x
y
x
(
)
13
2y
2x
13
2
2
7
2y
x
2
-
2
-
by
multiply
7
2
=
+
=
+
=
+
=
+
y
x
y
x
Now add the equations vertically
2
1
y
2
1
2
-
2y
-
-1
2y
-
13
2
2
14
4
2
=
−
−
=
=
=
+
−
=
−
−
y
x
y
x
