What would the most efficient first step to solving this 3

Last updated: 5/8/2023

What would the most efficient first step to solving this 3 Variable System of Equations x y z 7 J 22 9 2 4 O Solve the top 2 equations for y Substitute 4 in for z in the second equation and solve for y Multiply the second equation by 1 to cancel out the z s in the first two equations Substitute y in the second equation with 7 x y from the first equation