to find the equation of a line with two given coordinates, you want your equation to look like y=mx=b , m being the slope of the line, and b being the y intercept.
first you identify the two coordinates. for example : (1,2 ) (3,4) x1 y1 x2 y2 next you find the line's slope. to find the slope you take y2-y1 over x2 -x1 so: 4-2/ 3-1 = 2/2 = 1 the slope of the line is 1. next you find the y intercept. to find the y intercept, you plug in the coordinates 2=1(1)+b 2=1+b 1=b Y intercept = 1 <iframe name="tsc_player" scrolling="no" frameborder="0" src="http://www.screencast.com/users/bigkxcountry/folders/Algebra II Unit 2/media/5463943d-6031-4f9d-8c4b-7082cf6fecc3/embed" height="720" width="1152" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe> The equation used to convert inches to centimeters is Y=2.54x x is the number of inches, and y is how many centimeters the inches equal. The graph shows that the equation is linear. It makes a continuous graph, so the equation is always true.
So, if you are trying to find how many centimeters in a foot, you can use the equation y=2.54x first we find how many inches in 1 foot. there are 12 inches in a foot, so we plug 12 in for x y=2.54(12) y=30.48 so there are 30.48 centimeters in one foot (12 inches) :-) Absolute Value is how many places a number is from zero.
For example, |5 |and |-5| are both positive five places away from zero. It doesn't matter if you're finding the absolute value of a negative or a positive, the solution will always be positive. However, some equations can have more than one possible answer. If I have the equation : |x-5|= 10, I would solve and find that x=10. BUT, I also have to keep in mind that 10 could be negative. So I solve the problem again but change the outside number to negative. |x-5|= -10. I solve and find that x=-5. For this equation, I have two solutions. x=10 OR x=-5, so for the first equation, absolute value = 10. For the second equation, absolute value = 5 ( because the absolute value of a negative number is positive) Also, some absolute value equations have no solutions. for example, | x-4|=-6. If the equation equals a negative number to begin with, it has NO solution. :) As a young kid, I really enjoyed math. I was good at it and always had no trouble. Once I got into sixth grade, the math started to get a bit harder. We had anywhere from 20-50 problems to solve for homework every night. I got so sick of math and began to not like it. I worked hard to keep an A for a grade, but just barely.
In 7th grade I was put into pre-algebra, which was considered an advanced class, with only about 20-30 kids from our grade in it. It was actually very easy to me. That year in pre-algebra made it easy to tell who actually worked in 6th grade and who just cheated out of the back of the book. In 8th grade, I had algebra, and I really liked it. It was super easy for me. Last year, I had geometry, and I really didn't like it. The class was so confusing to me and I struggled to keep above a 93%. I always got B- to A- on my tests and it was just overall difficult for me. |
Author:I am Lara. I enjoy Cheerleading and shopping. |