Halp me plass halp me

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

A3-dimensional figure has a square base and 4 lateral faces that meet at a point. explain the difference between the cross sections when a slice is made perpendicular to the base through the vertex, and when a slice is made perpendicular to the base and not through the vertex

With finding limits of multi variable !