NOTES: Lesson 4-10: Writing Equations (Given a Table)
REMEMBER: y = mx + b
"m" stands for the
"b" stands for the
1)
If you are given a table of values, and you have verified that the table represents a linear relationship
(there is a constant rate of change), you can find both the slope and y-intercept from that table and
write the equation of that line.
.
.
2)
3)
X
Y
-2 -4
0
2
2
8
4
14
6
20
To find the slope (rate of change), use the formula m =
Ay
Ax
To find the y-intercept (initial value), find the coordinate point (x,y) in which the x-coordinate
is 0. (0._)
X Y
80
70
60
50
40
-2
-1
0
1
2
X
2
H
Y
-1 0,5
0
0
1
-0.5
2
1
slope:
of the line.
of the line.
y-intercept:
slope:
equation:
y-intercept:
slope
equation:
-intercept:
equation: