0. Постройте график прямой пропорциональности, заданной фор- мулой: \( \begin{array}{lll}\text { a) } y=3 x ; & \text { в) } y=x ; & \text { д) } y=2,5 x \\ \text { 6) } y=-1.5 x ; & \text { г) } y=-x ; & \text { е) } y=-4,5 x\end{array} \)

To plot the graphs of the given proportional relationships: 1. **Choose values for \( x \)**: Select \( x = -2, -1, 0, 1, 2 \). 2. **Calculate corresponding \( y \) values**: - For \( y = 3x \): \( y = -6, -3, 0, 3, 6 \) - For \( y = x \): \( y = -2, -1, 0, 1, 2 \) - For \( y = 2.5x \): \( y = -5, -2.5, 0, 2.5, 5 \) - For \( y = -1.5x \): \( y = 3, 1.5, 0, -1.5, -3 \) - For \( y = -x \): \( y = 2, 1, 0, -1, -2 \) - For \( y = -4.5x \): \( y = 9, 4.5, 0, -4.5, -9 \) 3. **Plot the points** on a coordinate plane and draw straight lines through them. All graphs will be straight lines passing through the origin. Positive slopes (\( y = 3x, y = 2.5x \)) slope upwards, while negative slopes (\( y = -1.5x, y = -x, y = -4.5x \)) slope downwards.