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October 20, 2014

October 20, 2014

Posted by **Jeffery** on Thursday, August 7, 2014 at 4:35pm.

What is the expression to solve for b

- math -
**Steve**, Thursday, August 7, 2014 at 6:03pmno idea what "b" represents.

And with only one data point, we cannot determine anything else. What was the starting pressure? Or, how much pressure did it lose each day?

Please make sure your posting accurately reflects the problem as presented, maybe with some mention of additional context, if any, as in the case of followup problems in a set.

- math -
**Jeffery**, Thursday, August 7, 2014 at 6:12pmAlberto filled his tire on a Saturday. Three days later the tire pressure in the tire measured 26 psi. On the following day one week after he had originally filled the tire, the tire pressure measured 18 psi.

I'm to to find b in y=-2x+b

I'm trying to solve the equation for b and substitute that value into the expression.

- math -
**Steve**, Thursday, August 7, 2014 at 7:10pmwe have two points: (3,26) and (7,18)

You are correct that y = -2x+b

So, plug in either point. For example,

26 = -2(3)+b

26 = -6+b

b = 32

y = -2x+32

- math -
**Jeffery**, Thursday, August 7, 2014 at 8:29pmI am still having difficulty finding the expression

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