solve the system of linear equations by graphing. round the solution to the nearest tenth as needed. Y+2.3=0.45x -2y=4.2x-7.8

I'm confused on this could anyone me and show me what i need to do to solve it.

Tamar is measuring the sides and angles of tuv to determine whether it is congruent to the triangle below. which pair of measurements would eliminate the possibility that the triangles are congruent

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