Variables in Context
ISEE Upper Level · Flashcards · Recall
ISEE UPPER LEVEL · FLASHCARDS
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QUESTION
What does the variable
b
b
b
represent if
y
=
m
x
+
b
y = mx + b
y
=
m
x
+
b
models total cost
y
y
y
with units
x
x
x
purchased?
QUESTION
What does the variable
m
m
m
represent if
y
=
m
x
+
b
y = mx + b
y
=
m
x
+
b
models cost
y
y
y
with a fixed fee
b
b
b
and per-unit rate
m
m
m
?
QUESTION
What does the variable
b
b
b
represent if
y
=
m
x
+
b
y = mx + b
y
=
m
x
+
b
models total cost
y
y
y
with units
x
x
x
purchased?
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ANSWER
b
b
b
is the fixed starting amount (the value when
x
=
0
x = 0
x
=
0
). The
y
y
y
-intercept
b
b
b
in the equation indicates the initial value of
y
y
y
when no units are purchased.
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