4x+6y=-10 8x+10y=-26 solve the system of the linear equation

Which equation represents a line that is parallel to the line whose equation is 3x-2y=7( show all work)

[10 points, algebra 2-simplifying complex fractions]according to my answer key the restrictions are -1 and 4. but why not positive 1?

Find the equation of the ellipse with the following properties. the ellipse with foci at (0, 6) and (0, -6); y-intercepts (0, 8) and (0, -8).edit: the answer is x^2 over 28 + y^2 over 64 = 1