To find the constant of proportionality in a table, identify the ratio of the dependent variable to the independent variable for any pair of values; this ratio should remain consistent across all pairs. In a graph, the constant of proportionality is the slope of the line, which represents the change in the dependent variable per unit change in the independent variable. In an equation of the form ( y = kx ), the constant of proportionality is the coefficient ( k ). If the relationship is proportional, ( k ) will be the same regardless of the values chosen.
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.
Which of the following is a disadvantage to using equations?
A table, a graph, and an equation.
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.
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.
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.
To find a value using a table, graph, or equation, you can identify the relationship between the variables involved. In a table, locate the known value and read across to find the corresponding value. For a graph, you can plot the known value on the appropriate axis and see where it intersects with the graph line to determine the other value. In an equation, substitute the known value into the equation and solve for the unknown variable.