The image of the linear function y = x + 3 and the area of the triangle surrounded by the x-axis and y-axis are

The image of the linear function y = x + 3 and the area of the triangle surrounded by the x-axis and y-axis are

When x = 0, y = 3
When y = 0, x = - 3
So area = 3 * 3 / 2 = 4.5