We can use a linear equation in this data set because we have a given rate of increase (sodium) over a given quantity (slices).
Therefore, we need to calculate the rate of change between both variables; how much sodium increases per the amount of slices of bread.
Calculating the slope:
• We are not given two coordinate pairs, so to calculate the slope, we need to know how much sodium is added per each piece of bread.
• We will take the difference of the sodium increases in the data set:
260-130 = 130
520-390 = 130
Therefore, the slope or rate of change is 130mg per 1 piece of bread. We can put this into a slope-intercept equation in the form of y=mx+b
Y=130x is the equation.
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