Let’s represent his sister’s sales as x
3/4ths of his sister’s sales would be:
3/4x
3 less than 3/4ths of his sister’s sales would be:
3/4x - 3
When converted to a household measurement, 9 kilograms is approximately equal to a
Tip: whenever y equals a number, the line is horizontal and the slope is 0. if the number equals x, the line will be vertical and there is no slope.

The shown pair of angles are Co interior angle pair, therefore the sum of those angles is 180°






The required value of x is 7°