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Online notes for Math 15, Math for Liberal Arts taught in the Fall 2016 semester at Laney College by Prof. Hubbard.
Special posts
Blog Archive
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2015
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June
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- Links to triangle classification with angles
- Simultaneous equation practice with Kramer's rule
- 100 coin (or ticket) problems
- The Richter scale: From two readings, the relative...
- Link to the computer science biographies
- Links to notes for 22 and 23 June
- Links to notes for 17 and 18 June 2015
- Links to homework 1, due Wednesday 17 June 2015
- Link to the four great mathematician biographies
- Syllabus for Summer 2015
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June
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About Me
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- 1 is a unit and not prime
- 100 coins
- all factors
- angles and sides
- area of a triangle
- binary
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- bitwise operators
- classification of three vertex triangle
- classification of triangles
- coin problems
- composite numbers
- compound interest
- computer science
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- Consumer Price Index
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- decimal
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- Finding the square root of any number
- five number summary
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- homework answers
- Important class dates Fall 2016
- inclusion-exclusion rule
- interest and loans
- Kramer's rule
- linear equations
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- Math history.
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- Pythagorean theorem
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- scientific notation
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- set theory
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1 comment:
6x + 5y = 18
2x - y = -4
First determinant (denominator)
| 6 5|
| 2 -1| = -6 -10 = -16
Swap out x column
| 18 5|
| -4 -1| = -18 +20 = 2
Swap out y column
| 6 18|
| 2 -4| = -24 - 36 = -60
So x = 2/-16 = -1/8
and y = -60/-16 = 15/4 = 3 3/4
=========
3x + 7y = 12
2x + 5y = -18
First determinant (denominator)
| 3 7|
| 2 5| = 15 - 14 = 1
Swap out x column
| 12 7|
| -18 5| = 60 + 126 = 186
Swap out y column
| 3 12|
| 2 -18| = -54 - 24 = -78
So x = 186/1 = 186
and y = -78/1 = -78
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