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Finding the y-intercepts of a circle

12/9/2016

In the standard (x,y) coordinate plane, an equation of a circle is x² + y² = 64. At what points does the circle intersect the y-axis?
A.) (0,1) and (0,-1)
B.) (0,8) and (0,-8)
C.) (0,9) and (0,-9)
D.) (0,10) and (0,-10)
E.) the circle does not intersect the y-axis

Evaluating a function

12/3/2016

If f(x) = x² + 3, then f(x + y) = ?
A.) x² + 2xy + y² + 3
B.) x² + 2xy + y²
C.) x² + 2xy + 3
D.) x² + 3 + y
E.) x² + y²

​ACT & SAT PRactice

Finding the y-intercepts of a circle

Evaluating a function

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ACT & SAT PRactice