This was brought to light on Monday when the words "initial value" was used in place of "y-intercept".
Today, while students created graphs, equations, and tables for three space ships in a race,
I had them write their statement using as many of the following vocabulary words that they could.
function
linear
slope
rate of change
y-intercept
initial value
proportional
Here is an example of one student's work.
"Spaceship #3 will win. The slope of the function is greater than the other linear proportional functions. It makes it proportional because the initial, or y-intercept, is 0."
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