What are some examples of direct variation in real life?

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Answer 1 · 2015-06-14T21:18:26

A car travels $x$ $x$ hours with a speed of $60 km/h$ $"60 km/h"$ $\to$ $->$ the distance: $y = 60 x$ $y = 60x$
A man buys $x$ $x$ bricks that cost $$ 1.50$ $$1.50$ each $\to$ $->$ the cost: $y = 1.50 x$ $y = 1.50x$
A tree grows $x$ $x$ months by $\frac{1}{2}$ $1/2$ meters each month $\to$ $->$
the growth: $y = \frac{1}{2} x$ $y = 1/2 x$