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December 18, 2014

December 18, 2014

Posted by **Jon** on Wednesday, April 22, 2009 at 12:38am.

y = mx+b

4 = -1(-5)+b

4 = 5+b

9 = b

y = 5x+9

I don't see what I missed. Do I subtract 5 on both sides? that would be y = 5x-1

- Math -
**Dr Russ**, Wednesday, April 22, 2009 at 5:58amy = mx+b

4 = -1(-5)+b

4 = 5+b

OK to here

9 = b No

y = 5x+9 No

I don't see what I missed. Do I subtract 5 on both sides? Yes

that would be y = 5x-1

No, the gradient is -1.

So go back to the original

y=mx+b

m=-1 and b=-1 and substitute

y=-1x-1

Check by substituting the values if x=-5

y=-1(-5)-1 = 4

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