The given point is (3,1) meaning x = 3 and y = 1. The x coordinate is always listed first in an ordered pair. The general format is (x,y)
We'll use m = 3, x = 3 and y = 1 to find the y intercept
y = mx+b y = m*x+b 1 = 3*3+b ... plug in m = 3, x = 3 and y = 1 1 = 9+b 1-9 = 9+b-9 ... subtract 9 from both sides -8 = b b = -8
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So we're given m = 3 as the slope and we just found that b = -8 is the y intercept
So y = mx+b updates to y = 3x-8. This is the final answer.
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Side Notes: * The slope of 3 means rise/run = 3/1 indicating each time we go up 3, we move to the right 1 * The y intercept -8 is the location on the vertical y axis numberline where the graph crosses. The point (0,-8) is on this line.
To find the unit price, you should divide what the money is by how many pairs the package has. So for this problem it would mean the equation would be 23.27/3 and the answer is 7.79.
