1. What is the graph of linear equation in two variables? A. Circle B. Curve line
C. Parabola
D. Straight line
2. What is the graph of x=2?
A. Vertical line that is 2 units at the right side of the y-axis
B. Vertical line that is 2 units at the left side of the y-axis
C. Horizontal line that is 2 units at the above the x-axis
D. Horizontal line that is 2 units at the below the x-axis
3. Which describes the graph of linear equation with a negative slope?
A. Increasing from left to right
B. Increasing from right to left
C. Horizontal line
D. Vertical line
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