Solve the Linear Systems by the method of elimination using Gaussian elimination for matrix linear algebra.$$

linear equation $1(2$x$+4$y$+6$z$=-12)$ 

Linear equation $2(2$x$-3$y$-4$z$=15)$

Linear equation $3(3$x$+4$y$+5$z$=-8)$

Use all three simultaneously and put into a matrix to solve with gaussian elimination.