To identify a unit rate or constant of proportionality in a table, look for a consistent ratio between two quantities, where one quantity is typically expressed per unit of the other. In a graph, the constant of proportionality is represented by the slope of the line; if the line passes through the origin, the slope indicates the unit rate. In an equation of the form (y = kx), the constant (k) represents the constant of proportionality, indicating how much (y) changes for each unit increase in (x).
To determine if a relationship is linear from a table, check if the differences in the y-values (output) corresponding to equal differences in the x-values (input) are constant. For a graph, a linear relationship will appear as a straight line. In an equation, if the equation can be expressed in the form (y = mx + b), where (m) and (b) are constants, it indicates a linear relationship.
A table, a graph, and an equation.
Which of the following is a disadvantage to using equations?
Divide any number in the second set by the corresponding number in the first set.
In a table, divide a number in one column by the corresponding number in the other column. In a graph it is the gradient of the line. The equation, for the variables X and Y will be of the form Y = mX and the constant of proportionality is m.
To identify a unit rate or constant of proportionality in a table, look for a consistent ratio between two quantities, where one quantity is typically expressed per unit of the other. In a graph, the constant of proportionality is represented by the slope of the line; if the line passes through the origin, the slope indicates the unit rate. In an equation of the form (y = kx), the constant (k) represents the constant of proportionality, indicating how much (y) changes for each unit increase in (x).
If the relationship between two variables in a table is that of direct variation, then the unit rate or the constant of proportionality is determined by dividing any non-zero value of one of the variables by the corresponding value of the other variable.
Divide an entry for one variable in the table by the corresponding entry for the other variable.
There are three ways: a table, a graph, and an equation.
Graph and Table: http://i50.tinypic.com/szhr4k.png
Which of the following is a disadvantage to using equations?
A table, a graph, and an equation.
equation, table or a graph
Divide any number in the second set by the corresponding number in the first set.
When acceleration is constant, one equation of kinematics is: (final velocity)^2 = 2(acceleration)(displacement) + (initial velocity)^2. When you are graphing this equation with displacement or position of the x-axis and (final velocity)^2 on the y-axis, the equation becomes: y = 2(acceleration)x + (initial velocity)^2. Since acceleration is constant, and there is only one initial velocity (so initial velocity is also constant), the equation becomes: y = constant*x + constant. This looks strangely like the equation of a line: y = mx + b. Therefore, the slope of a velocity squared - distance graph is constant, or there is a straight line. Now, when you graph a velocity - distance graph, the y axis is only velocity, not velocity squared. So if: v^2 = mx + b. Then: v = sqrt(mx + b). Or: y = sqrt(mx + b). This equation is not a straight line. For example, pretend m = 1 and b = 0. So the equation simplifies to: y = sqrt(x). Now, make a table of values and graph: x | y 1 | 1 4 | 2 9 | 3 etc. When you plot these points, the result is clearly NOT a straight line. Hope this helps!
In general you cannot. Any set of ordered pairs can be a graph, a table, a diagram or relation. Any set of ordered pairs that is one-to-one or many-to-one can be an equation, function.