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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 = ax
It'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.
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How do you tell if a math table is inversely proportional or directly proportional?
Generally, if y increases as x increases, this is a hint that the quantity is directly proportional, and if y decreases as x increases, the relation might be inversely proportional. However, this is not always the case. x and y are directly proportional if y = kx, where k is a constant. x and y are inversely proportional if y = k/x, k is constant. This is the best way to tell whether the quantities are directly or inversely proportional.
Is the equation y equals 2x directly proportional?
According to the equation [ y = 2x ], 'y' is directly proportional to 'x' .
What is inversely and directly proportional?
Two variables, X and Y are said to be in inversely proportional is X*Y - k where k is some non-zero constant. X and Y are said to be directly proportional if X = c*Y where c is some constant.
If y is directly proportional to x and y equals 12. What is the value of x when y equals 5?
Insufficient information. What is x when y = 12?
What is the difference between directly propotional and inversely proportional?
In directly proportional the two variable vary in the same "direction". So, if one increases, the other increases.In inversely proportional, the two variable vary in opposite "directions". So, if one increases, the other decreases.
