6. Find the equation in standard form of the circle with center (2, -3) and radius 4.
Equation:
7. Find the center and radius of the circle with equation $x^2 + y^2 + 2x - 4y - 4 = 0$.
Center:
Radius:
In exercises 8 and 9, find the slope-intercept form of the line satisfying the given condition.
8. The line has slope 3 and passes through (1,3).
Slope-Intercept Form:
9. The line is parallel to $2x + 3y = 5$ and passes through (1,3).
Slope-Intercept Form:
In exercises 10 and 11, find the domain of each function.
10. $f(x) = \frac{1}{2x+3}$