How do we get to know which is a inverse proportion and which is a direct proportion??
Dear student,
Direct proportion : Two values x and y are directly proportional to each other when the ratio x : y or is a constant (i.e. always remains the same). This would mean that x and y will either increase together or decrease together by an amount that would not change the ratio.
If there are two quantities, when quantity x is increased the quantity y also increases then it is a direct proportion.
Indirect proportion : Two values x and y are inversely proportional to each other when their product xy is a constant (always remains the same). This means that when x increases y will decrease, and vice versa, by an amount such that xy remains the same.
If there are two quantities, when quantity x is increased the quantity y decreases then it is an indirect proportion.
Regards
Direct proportion : Two values x and y are directly proportional to each other when the ratio x : y or is a constant (i.e. always remains the same). This would mean that x and y will either increase together or decrease together by an amount that would not change the ratio.
If there are two quantities, when quantity x is increased the quantity y also increases then it is a direct proportion.
Indirect proportion : Two values x and y are inversely proportional to each other when their product xy is a constant (always remains the same). This means that when x increases y will decrease, and vice versa, by an amount such that xy remains the same.
If there are two quantities, when quantity x is increased the quantity y decreases then it is an indirect proportion.
Regards