Expert: Richard J. Raridon - 8/2/2006

Question
THANKS SO MUCH ON MORE QUESTION

how do i write an equetion of the line for these 4 questions

a(7.4) m=5
b(-3.-2) m=-1/2
c(3,-2) and d(4,5)
e(1,7) and d(-3,5)
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Followup To

Question -
A spherical ballon is blown up from a radius of 8 cm to one of 24 cm

what is the change in itz surface area?

Answer -
area = 4(pi)r^2 so it goes from 256(pi) to 2304(pi)

Answer
The standard equation for a line is y=mx+b where m is the slope and b is the y-intercept.  
1. 4 = 5*7+b so b = -31 and you have y = 5x-31
2. -2 = (-1/2)(-3)+b so b = -7/2 and you have y=(-1/2)x-7/2
or 2y = -x-7
3. -2 = 3m+b and 5 = 4m+b so y = 7x-23
4. 7 = m+b and 5 = -3m+b so 2y = x+13