$79.65 is the correct answer
Slope intercept form:
y=mx+b
m=slope
b=y-intercept
y=-3x+b
Plug in the given coordinate and solve for b (12,5)
5=-3(12)+b
5=-36+b
41=b
Final answer:
<span>y=-3x+41<span>
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By the 7th week, 2,187 people will have found out the secret.
