Need help on question 6 got the first one need help on the second part

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

Create a data set with 8 points in it that has a mean of approximately 10 and a standard deviation of approximately 1.

In the figure below, ∠dec ≅ ∠dce, ∠b ≅ ∠f, and segment df is congruent to segment bd. point c is the point of intersection between segment ag and segment bd, while point e is the point of intersection between segment ag and segment df. the figure shows a polygon comprised of three triangles, abc, dec, and gfe. prove δabc ≅ δgfe.