Question 850135
Give the slope and y-intercept for the line that passes 
through (-7,9) and (6,12). 
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Form: y = mx + b
m is the slope
b is the y-intercept
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slope = (change in y)/(corresponding change in x) = (12-9)/(6--7) = 3/13
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Using x = 6, y = 12, m = 3/13, solve for "b":
12 = (3/13)6 + b 
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12 = (18/13) + b
Multiply thru by 13 to get:
13*12 = 18 + 13b
156 = 18 + 13b
Subtract 18 from both sides
13b = 138
Divide both sides by 13 to get:
b = 10.62 when rounded to the hundreth's place
b is the y- intercept
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Cheers,
Stan H.
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