Linear Equations in Two Variables

Which statement is true about a linear equation in two variables?

1. It has only one solution.
2. It has no graph.
3. Every solution is a point on its graph.
4. It always forms a circle.

The graph of x = 4 is

1. A horizontal line
2. A vertical line
3. A circle
4. A slant line

Which ordered pair satisfies 3x - y = 5?

1. (2, 1)
2. (1, 2)
3. (3, 3)
4. (4, 5)

Which equation represents a straight line?

1. y = 3x + 2
2. y = x^2 + 1
3. y = √x
4. y = 1/x

Which variable is usually plotted on the vertical axis?

1. x
2. y
3. z
4. None

Which variable is usually plotted on the horizontal axis?

1. y
2. x
3. Both
4. Neither

Which of the following points lies on the graph of y = 2x?

1. (2, 2)
2. (3, 6)
3. (4, 5)
4. (1, 3)

If x = 2, what is the value of y in the equation x + y = 7?

1. 3
2. 4
3. 5
4. 6

Which ordered pair satisfies the equation 2x + y = 9?

1. (2, 4)
2. (3, 3)
3. (4, 2)
4. (5, 1)

How many solutions does a linear equation in two variables have?

1. Zero
2. One
3. Two
4. Infinitely many

Which of the following is a solution of the equation x + y = 8?

1. (2, 5)
2. (3, 5)
3. (6, 1)
4. (5, 2)

The standard form of a linear equation in two variables is

1. ax^2 + by = c
2. ax + by + c = 0
3. x^2 + y^2 = 1
4. xy = c