Solve the equation for y. then find the value of y for the given value of x.
7x-xy=-18; x=-4.

For problems 29 - 31 the graph of a quadratic function y=ax^2 + bx + c is shown. tell whether the discriminant of ax^2 + bx + c = 0 is positive, negative, or zero.

Credit card a offers an introductory apr of 3.4% for the first three months and standard apr of 15.7% thereafter,

1. evaluate 8x(2)y9(-2) for x=-1 and y=2 2. simplify the equation. -() 3. simplify the expression. [tex]\frac{5}{x(-2) y9(5)}[/tex]