Grade 9 - Parallel and Perpendicular lines

Homework check tomorrow.
Pg. 381-383 #1,2,3,5,6-10.
Many questions but doable for those of you that worked hard today in class.
Mrs. Gascho

Grade 10 - Started a new unit

Today we completed (or started to complete) an assignment on parabolas using the graphing calculators. People worked REALLY well today in Period 5. Great work!
We will work on finishing this sheet tomorrow.
Mrs. Gascho

Grade 9 - Equation of a line cont'd

We know the equation of a line is y=mx+b where m is the slope and b is the y-intercept. Yesterday we were given the values for m and b and were asked to determine the equation of the line. Pretty straight forward. What if we were given the slope and 1 point that wasn't the y-intercept OR we were given two points on the line, could you determine the equation of the line??
Ex. 1. Determine the equation of the line that has a slope of -1/2 and passes through point A(4,1).
y=mx+b we know m=-1/2 and from the coordinates x=4 and y=1. Substitute these in and solve for b.
1=(-1/2)(4) + b
1=-2 +b
1+2 = b
b = 3
therefore y = -1/2x + 3


Ex. 2. Determine the equation of a line that passes through point A(1,4) and point B(4,-2).
We do the same thing as example one but we first have to figure out the slope by
m=y2-y1/x2-x1
Check the notes in class for full solutions.

Assigned work: pg. 350#1, 5, 7, 8, 11a

Grade 10 - Test Day

Today we are having out measurement unit test. The majority of the questions are taken directly from your practice test and the review sheet. I'm really hoping you completed them all and will be confident on this test today.
Good luck!
Mrs. Gascho

Grade 9 - Equation of a line

Given m is the slope and b is the y-intercept, can you determine the equation of the line? y = mx + b.
Determining the equation of the line makes graphing a lot easier to do. Using the graphing calculators we can input the equation of a line in slope-y-intercept form and find similarities between lines and determine whether or not they are parallel.
Assigned work: pg. 179-181 #1ace, 2ace, 3ac, 4aI, iii, 5ai, iii, v, vii
The other two problems from the handout from yesterday are also due.

Grade 10 - Surface area and volume of a cylinder

Well today we discussed the two formula used to solve for a cylinder. V = (pi)r^2h
SA = 2(pi)r^2 + 2(pi)rh
The tricky questions involved converting units first before inserting them into the formula. Some questions gave you the diameter, remember that the radius is d/2.
From the handout: 1ac, 2ac, 3ac, 4, 5, 8, 10ab.
I will be doing a homework check tomorrow!
Mrs. Gascho

Grade 9 - Slope without graphing

Using the change in the rise over the change in the run we can obtain the slope.
m=y2-y1/x2-x1

You use the coordinates of any two points on a line to determine your x and y values.
pg. 135-138 #(3,4 do not graph), 6, 7, (14,15 do not graph)

The questions get tougher as you continue but just think about how much is the line rising or running to figure out the missing values.
Mrs. Gascho
Math help tomorrow at lunch.