## Math 7A, Lesson 7, 10/26/2014

Weidong Posted in Fall 2014, Homework, Teaching info
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[I am out of town and this class was taught by our substitute teacher Zheng Laoshi]

We further study solving linear inequalities using the properties we learned last time. We look at applications of simple inequalities.

Homework:

Page 18. #8 – #13, #20, #23 – #25.

## Math 7A, Lesson 6, 10/19/2014

Weidong Posted in Fall 2014, Homework, Teaching info
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We study simple linear inequalities. Unlike a simple linear equation where there is always one and only one solution, a linear inequality can have many solutions. We study the properties of ineqaulities:

If a > b, and k > 0, then ak > bk.

If a > b and k < 0, then ak < bk.

If a > b, then a + c > b + c.

If a < b, and b < c, then a < c.

The above properties are also true for cases of a >= b.

We talked about using the above properties to solve very simple inequalities like 4x < 28, or 3x >= 36.

Homework:

Page 17, #1 to #7, #14.

## Math 7A, Arithmetic Sequence and Geometric Sequence Answers

Weidong Posted in Fall 2014, Teaching info
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Some parents ask for the answer sheet for the homework on arithmetic and geometric sequences, as it is a bit hard.

Please find it below:

## Math 7A, Lesson 5, 10/5/2014

Weidong Posted in Fall 2014, Homework, Teaching info
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We study the slopes of line graphs, which is to measure the steepness of a straight line, and is defined to be ratio of y rise over x run, or the ratio of vertical change over the horizontal change.

We talk about the meaning of positive slope and negative slope. We study the special cases of horizontal line where the slope is always 0, and vertical lines where the slope is undefined.

We practice on how to calculate slopes based on the given information.

Homework:

Page 11, #9 to #17.