# Direct proportionality is given by the formula y = -1 / 3x. Find the value of x at y = 10.

August 25, 2021 | education

| To find the value of x, it is necessary to substitute the given value of y = 10 into the given equation of direct proportionality, and solve the equation:

y = – 1 / 3x;

3x * y = – 1;

3x = – 1 / y;

x = – 1 / 3y;

substitute the value for y = 10:

x = – 1 / (3 * 10);

x = – 1/30.

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