4x - 9y =9 -x + 3y = 6 rewrite one of the two equations above in the form ax + by = c, where a, b, and c are constants, so that the sum of the new equation and the unchanged equation from the original system results in an equation in one variable.

It seems like you are solving a system of equations by elimination. One way to solve eliminate a variable would be to multiply the last equation by 3:

4x - 9y = 9 > 4x - 9y = 9

3(-x + 3y = 6) > -3x + 9y = 18

x = 27

The -9y and 9y cancel out if you multiply the bottom equation by 3.

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step-by-step explanation:

a net is a diagram that shows a “flattened” view of a solid. in a net, each face and base is shown with all of its dimensions. a net can also serve as a pattern to build a three-dimensional solid.

a pyramid is a three-dimensional object with a base that is a polygon and triangular faces that meet at one vertex.

" the net of a triangular pyramid consists of four triangles. the base here we are given of the pyramid is a equilateral   triangle, and the lateral faces are also triangles "