# 004 PreAssessment • Name:

$\text{slope m}=\frac{\left({y}_{2}-{y}_{1}\right)}{\left({x}_{2}-{x}_{1}\right)}$
point-slope form: $\left(y-{y}_{1}\right)=m\left(x-{x}_{1}\right)$

1. The first graph plots data from a soap density measurement laboratory. The slope of the line is the density of the soap.
1. __________ Calculate the slope of the line.
2. ______________ Determine the y-intercept of the line.
3. y = _________ x + __________ Write the y = mx + b slope-intercept equation for the line.
4. [float] or [sink] The slope of the line is the density of soap. If the density of the soap is less than one gram/centimeter³ then the soap would float. If the density of the soap is greater than one gram/centimeter³ then the soap would sink. Based on the above, will this soap float or sink?
2. A student gathered the data seen in the table below. Plot the data on the graph.
1. __________ Calculate the slope of the line.
2. __________ Calculate the intercept of the line.
3. __________ cm. How far will the RipStik travel in 23 seconds?
4. __________ seconds. How long in seconds for the RipStik to travel 7500 centimeters?
3. __________ What is the slope of the line y = 2.0 + 0.15x?
4. __________ What is the y-intercept of the line y = 2.0 + 0.15x?
5. _______________ What math class are you in? If you are not in math this term, what is the highest math class you took?