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Unknown

Definition Of Unknown

An Unknown in an equation is the variable to be solved.

More About Unknown

The solution of the equation is the value of the unknown.

Examples of Unknown

In x + 7 = 19, x is the unknown. On solving the equation, we get x = 19 - 12 = 7 which is the value of the unknown

Video Examples: Math Worksheet - iCoachMath

Solved Example on Unknown

Ques: Find the values of the unknowns,x and y, from the given system of equations.

- x + y = 4
6x- 5y= -11

Choices:

A. (- 9, 13)
B. (- 9, - 13)
C. (9, 13)
D. (9, - 13)
Correct Answer: C

Solution:

Step 1: y = x + 4 [Rearrange Equation 1.]
Step 2: 6x - 5(x + 4) = -11 [Replace ywith x + 4 in Equation 2.]
Step 3: x - 20 = -11 [Combine like terms.]
Step 4: x = 9 [Add 20 to both sides.]
Step 5: y = 9 + 4 [Substitute x = 9 in the revised Equation 1.]
Step 6: y = 13 [Simplify.]
Step 7: The solution for the linear system is (9, 13).