Parabolas STAAR EOC Practice

Which graph is a parabola?

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Which equation would give the graph of a parabola?

• y = 2x - 3

• y = x₂ + 1

• y = x² + 4

Is the following parabola concave up or concave down?

• Concave down

• Concave up

• Neither

How can you tell whether a parabola is facing up or facing down by looking at the equation?

• The vertex tells you the direction of the opening
• The value of "a" tells you the direction of the opening.
• All parabolas open upward
• All parabolas open downward

If the a value is positive in the equation of y = ax² + c, which direction does the graph open?

• up

• down

• left

• right

If the a value is negative in the equation y = ax² + c , which direction does the parabola open?

• up

• down

• left

• right

The X axis goes...

• Horizontally, or across
• Vertically, or up and down

The Y axis goes...

• Vertically, or up and down
• Horizontally, or across

Which letter in a equations y = ax² + c represents the y-intercept?

• a

• b

• c

What is the y-intercept of the parabola y = 5x² - 3

• 5

• 3

• - 3

• -5