Direct Proportion Flashcards

GCSE Mathematics (Edexcel) 1MA1

Direct Proportion

A relationship where two quantities increase or decrease in the same ratio.

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Terms in this set (10)

1

Direct Proportion

A relationship where two quantities increase or decrease in the same ratio.

2

Equation for Direct Proportion

y = kx, where k is the constant of proportionality.

3

Constant of Proportionality

The constant value (k) that relates two variables in direct proportion.

4

Graph of Direct Proportion

A straight line passing through the origin (0, 0).

5

Finding k in Direct Proportion

Divide y by x (k = y ÷ x) when given a pair of values.

6

Direct Proportion in Words

If x doubles, y also doubles. If x halves, y also halves.

7

Direct Proportion Formula Rearranged

k = y ÷ x or x = y ÷ k.

8

Real-Life Example of Direct Proportion

The cost of apples is directly proportional to the weight of apples bought.

9

Identifying Direct Proportion from a Table

Check if the ratio y ÷ x is constant for all pairs of values.

10

Units in Direct Proportion Problems

Ensure units for both variables are consistent before solving.

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