ACT Math 4.5 Coordinate Geometry
ACT Math: Coordinate Geometry Drill 4, Problem 5. What is the equation of the graph in the video?
|ACT Math||Coordinate Geometry|
|ACT Mathematics||Coordinate Geometry|
|Algebra||Coordinates and Graphs|
|Coordinate Geometry||Graphing equations|
Graphs of points, lines, polynomials, and circles
The relations between equations and graphs
|Foreign Language||Arabic Subtitled|
|Product Type||ACT Math|
on the line are .5, 0 and 0, 2. And since the line slopes downward, we know
its slope will be negative.
Now back to our old friend y equals mx plus
b, the standard form of a line. We can get the slope m by doing the
y over x dance like this...
and we get y2 minus y1 over x2 minus x1...
...or 2 minus 0 over 0 minus .5... ...which equals negative 2 divided by a half
or... negative 4. So we have y equals negative 4 times x plus
b...and we can just plug in some points to get b. Let's try the 2nd point - zero, 2
We have 2 equals negative 4 times 0 plus b or... 2 equals... b.
Which is answer C.