Question

How is writing an equation to represent a situation involving two variables similar to writing an equation to represent a situation involving only one variable?

How is it different?

Answer 1

The similarities and differences between one and two variable expressions are highlighted below.

Equation involving one variable can be written thus :

• 6y = 24

Equation involving two variables can be written thus :

• 6y + 2x = 32

.

Similarities :

• The concept of representing variables in both situations are the same, with x and y depicting the variables in both scenarios.

• The expression on the right - hand side is expected to be equal to the expression on the left hand side of the equation.

Differences:

• Only one unknown is involved when dealing with one variable while two unknowns are associated with two variable expressions.

• Equations involving one unknown are fairly straightforward to solve while those involving two variables may require the use of simultaneous equations in other to obtain a solution.

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