Chapter — Graphng
0
i
c
e
dentify And
orrect the
rrors
In the second column, identify the error(s) in the worked solution or validate its answer. If the worked solution
is incorrect, solve the problem correctly in the third column and validate your answer.
Identify Errors
Worked Solution
Correct Process
Validation
or Validate
1) If the y-coordinate is 15,
what is the ordered pair
solution for the equation
2x + 3y = 90?
2 15
( ) +
3
y
=
90
+
y
=
30 3
90
3
y
=
60
y
=
20
(15, 20)
2) Find the x-intercept:
4x + y = –1
Let y = 0
4
x
+ = -
0
1
1
x
= -
4
3) Given the points (–6, 3) and
(1, –1), calculate the slope
of their line.
- -
3
( )
1
m =
1
- -
(
6
)
4
slope
=
7
4)
Find the y-intercept of the
following equation:
x + y = 1
x y
+ =
1
x
+ =
0 1
x
=
1
The y-intercept is (1, 0).