An equation is formed of two equal expressions. The correct option is D.
What is an equation?
An equation is formed when two equal expressions are equated together with the help of an equal sign '='.
Given the two systems of equations,
y = -(1/3)x + 6
y = (1/3)x - 6
Substitute the value of y from equation one with two, we will get,
-(1/3)x + 6 = (1/3)x - 6
6 + 6 = (1/3)x + (1/3)x
12 = (2/3)x
x = (12×3)/2
x = 18
Substitute the value of x in any one of the equations,
y = (1/3)x - 6
y = (1/3)(18) - 6
y = 0
Hence, the solution of the system of equation is (18, 0).
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