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โˆ™ 2012-04-12 15:47:54
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Q: Does x increase or decrease making the y increase or decrease?
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If the coefficient of determination is 0.81 the coefficient of correlation?

Given co-efficient of determination, r2 = 0.81. co-efficient of correlation, r = square root of 0.81 = +0.9, if the data have move in the same direction.(Let x and y as variables then x and y have linear relationship and x increase or decrease and y also have increase or decrease) = -0.9, if the data have move in the opposite direction.(Let x and y as variables then x and y have linear relationship and x decrease or increase and y is also increase or decrease)

What does a positive correlation between variables x and y imply?

It implies that an increase in x is accompanied by an increase in y. And similarly, they decrease together.

What is percent increase and decrease?

It is the increase or decrease in some measure that is put into the context of the starting value. Generally speaking, the change from x to y is y - x. If y is greater than x then y - x is positive and so it is an increase, while if y is less than x then y - x is negative and so it is a decrease. The percentage increase (or decrease) is 100 times the change divided by the initial value. That is, 100*(y - x)/ x which is equal to 100*(y/x - 1) Normally, x should be positive. Otherwise you have the situation where a change from +50 to -25 = -150% and from -50 to +25 = -150% The same percentage changes, but very different stories behind them!

What is a direct proportion?

Two quantities x and y are said to be in direct proportion if whenever the value of x increase (or decrease), then the value of y increases (or decrease) in such a way that the ratio x/y remains constant.

In an inverse relationship how do the values of y change as the values of x increase?

Y would decrease in value as X increases in value.

When the y- value increase as the x-value decrease how can it be shown in a table?

By finding the differences between the x and y columns on the table.

What exists if the y-coordinates decrease as the x-coordinates increase?

A negative correlation

What exists is the y-coordinates decrease and the x-coordinates increase?

Example: draw the graph where y = 10 - x , from x = 0 to 5 step 1

How are direct variations different from inverse variations?

Consider two variables x and y. If x varies directly as y then y = cx where c is some constant of variation. This means that whenever x increases, y increases and it increases by c times as much as the increase in x. Also, if x decreases, then y decreases by c times the decrease in x. If x varies inversely as y then y = k/x where k is some constant of variation. This means that whenever x increases, y decreases and it decreases by k times as much as the increase in x. Also, if x decreases, then y increases by k times the decrease in x.

Is y equals 9 divided by x a proportional relationship?

Yes. It is inversely proportional. An increase in x results in a proportional decrease in y and vice versa.

What happens when the y value increases does the x value increase decrease or stay the same?

The value of x is directly proportional to to the value of y.hence when the value of x increases the value of y decrteses and vice verse

How do i graph the equation and find the y-intercept y equals 3 x - 2?


How do you find percent increase and decrease?

If you start with a value x and end with a value y thenPercentage change = 100*(y/x - 1)If y > x then the above is positive and is a percentage increase andif y < x then the above is negative and is a percentage decrease.

What is the solution of equation y equals x plus 9 because I'm having trouble with Linear Equations?

There are an infinite number of solutions eg: (x = 1 y = 10). For every unit increase or decrease in x there is a corresponding unit change in y.

What exist if the y-coordinated decrease as the x-coordinates increase?

You have a negative correlation, or a line, getting lower as it goes further to the right.

When the y-values decrease and the x-values increase how is that shown on a graph?

This has a negative slope (it slopes 'down' as you move from left to right).

Why does the demand curve have negative slope?

because quantity is on x axis and price is on y axis and as the price increase the demand decrease

When the y values decrease and the x values increase how is that shown on a graph?

That is a curve that slopes downward from top left to bottom right.

What is a inverse proportional relationship?

It is a relationship between two variables, x and y which is defined by xy = c where c is some constant. In such a relationship, an increase in x leads to a decrease in y and conversely.

How does a direct variation look?

Two variables, x and y are said to be in direct variation with one another if they are related by an equation of the form y = cx where c (&gt;0) is the constant of [direct] variation. In the coordinate plane, this equation gives rise to a straight line, through the origin, and with a gradient (slope) = c. What this means that both x and y are 0 together, and that every increase (or decrease) in x results in an increase (decrease) of c times that amount in y.

How is it shown on a table if the y axis decreases and the x axis increases?

Axes do not increase or decrease so the question cannot be answered sensibly.

Y is directly proportional to x?

If a variable (such as y) is directly proportional to another variable (such as x), they both increase and decrease simultaneously. An equation for two directly proportional variables is:y = axIt's sort of like a linear equation, but it always goes through the origin.An example is y = 6x. Notice that it forms a straight line and crosses the origin, and that y and x increase in the same direction.

What is direct and inverse relationships are?

Let us say that we are considering two quantities which we can call x and y. These could be anything - temperature and pressure, population and crime rate, weight and height, etc. If these have a direct relationship (or a direct correlation as we might also call it) that means that if you increase one, you increase the other, or if you decrease one, you decrease the other. So if x increases, y also increases. If it is an inverse relationship (or correlation) that means that increasing one will decrease the other. If you get more x, you will then have less y. Note that there is a third alternative. Many things have no relationship, either direct or inverse, so if you increase x, that tells you nothing about what will happen with y. These quantities would be said to have no correlation.

Y-values decrease as the x-values increase how is it shown on a table and a graph?

If the table consists of a column of x values and a column of y values, and if the x values are in increasing order, ten the y values will be in decreasing order. The graph of y against x will have a downward slope. That is, the line or curve will be going from top left of the chart to bottom right.

When you translate a figure downward does the y coordinate of the image increase or decrease?

It decreases.