If: 5x+1 = 21
Then: 5x = 21-1 => 5x = 20
Divide both sides by 5 and so x = 4
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Solve this system of equations. 5x+3y+z=-29 x-3y+2z=23 14x-2y+3z=-18 Write the solution as an ordered triple.
x=2 y=7 5x+3y= 5 7 x 2 x 3 ____ _____ 10 21 21 + 10 _______ 31
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It is a linear equation in the variable x. You can solve for x using algebra: -5x + 3 = -22 -5x = -25 -x = -5 x = 5
To solve an equation with three unknowns, x, y and z, you require 3 independent equations.