When using the substitution method for solving a system of linear equations in three variables, what should be the first step?
Add any two equations together to create one equation,
Solve one equation for one of its variables.
Start by guessing at values for the variables.
Graph the three equations.

Find the solution of system of equation y= x-4 y=4x+2

Simplify -4z+2y-y+-18z a.-22z+y b.-14z+2 c.3y+22z d. y +14z

What is the next step in the given proof? choose the most logical approach. a. statement: m 1 + m 2 + 2(m 3) = 180° reason: angle addition b. statement: m 1 + m 3 = m 2 + m 3 reason: transitive property of equality c. statement: m 1 = m 2 reason: subtraction property of equality d. statement: m 1 + m 2 = m 2 + m 3 reason: substitution property of equality e. statement: 2(m 1) = m 2 + m 3 reason: substitution property of equality