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How do I set up the equation of (-8,7) with a slope of 6? I was helping my son and I just can't quite remember.
Y=?mb+7....?
Hello Belinda,
What you seek is the equation of a linear function...
Two popular ways:
1. y=mx+b, where m=slope, b=y-intercept.
- so, y=6x+b, now substitute (-8,7) and solve for 'b'
- 7=6(-8)+b ==> b=7+48=55...y=6x+55
OR
2. y-y1=m(x-x1), where m=6 with point(x1,y1)
- so, y-7=6(x-(-8)) ==> y-7=6(x+8) ==> y=6x+48+7
- which also gives y=6x+55
OK?
Abe
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| Rating(1-10) | Knowledgeability = 10 | Clarity of Response = 10 | Politeness = 10 |
| Comment | thanks, it's been so long. some things do stick but not nessarily in the right order. mb for mx.... duh! belinda | ||
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Answers by Expert:
Abe Mantell
Expertise
Hello, I am a college professor of mathematics and regularly teach all levels from elementary mathematics through differential equations, and would be happy to assist anyone with such questions!
Experience
Over 15 years teaching at the college level.
Organizations belong to
NCTM, NYSMATYC, AMATYC, MAA, NYSUT, AFT.
Education/Credentials
B.S. in Mathematics from Rensselaer Polytechnic Institute
M.S. (and A.B.D.) in Applied Mathematics from SUNY @ Stony Brook
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