18=3(3x-6)
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You cannot solve one equation in three unknowns. You need three independent equations.
Add 2.9 to both sides. y = 8.2
The basic definition of speed is: speed = distance / time Solve this equation for distance, or solve it for time, to get two additional versions of the equation.
A linear equation in three variable.
Select any three values of x in the domain of the equation. Solve the equation at these three points for the other variable, y. Then each (x, y) will be an ordered pair that is a solution of the equation.