What is the solution to the system of equations?
2x+y−z=−3
5x−2y+2z=24
3x−z=5
2x+y−z =−3
5x−2y+2z = 24
3x−z = 5 (1)
Using the last equation z = 3x - 5
Using (1) and the first equation we get :
2x + y - (3x - 5) = -3
2x + y - 3x + 5 = -3
-x + y + 5 = -3
y = x - 8 (2)
Sub (1) and (2) into the second equation and we have
5x - 2(x - 8 ) + 2(3x - 5) = 24
5x - 2x + 16 + 6x - 10 = 24
9x + 6 = 24 subtract 6 from each side
9x =18 divide both sids by 9
x = 2
And using (2)... y = 2 - 8 = -6
And z = 3(2) - 5 = 6 - 5 = 1
So (x, y, z) = ( 2, -6, 1)