A boy is three years than his sister. Three years ago he was two-thirds of his sister's age.What are their present ages?
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In this exercise, we have the following point:
Let's assume that y varies directly as x, so this implies we can writ y as the product of x and some non-zero real constant k. In a mathematical language:
As you can see, this is the equation of a line whose slope is k and passes through the origin. Therefore, the slope of the line is the constant of proportionality we are looking for:
Direct and indirect proportionality: brainly.com/question/10945121
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