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Using the Action Menu

usolve

Function: Returns the solution of an equation or inequality.

Syntax: solve(Exp/Eq/Ineq [,variable] [ ) ]

•For this syntax, “Ineq” also includes the ≠ operator.

•“x” is the default when you omit “[,variable]”. solve(Exp/Eq,variable[, value, lower limit, upper limit] [ ) ]

•This syntax does not support “Ineq”, but the ≠ operator is supported.

•“value” is an initially estimated value.

•This command is valid only for equations and ≠ expressions when “value” and the items following it are included. In that case, this command returns an approximate value.

•A true value is returned when you omit “value” and the items following it. When, however, a true value cannot be obtained, an approximate value is

returned for equations only based on the assumption that value = 0, lower limit = –∞, and upper limit = ∞.

solve({Exp-1/Eq-1, ..., Exp-N/Eq-N}, {variable-1, ..., variable-N} [ ) ]

• When “Exp” is the first argument, the equation Exp = 0 is presumed.

Example: To solve ax + b = 0 for x

Menu Item: [Action][Equation/Inequality][solve]

Example: To solve simultaneous linear equations 3x + 4y = 5, 2x – 3y = –8

Menu Item: [Action][Equation/Inequality][solve]

You also could input the simultaneous equations shown in this example using the 2D

keyboard key. The following shows the required input syntax. Exp-1/Eq-1

Exp-N/Eq-N variable-1, ..., variable-N

•The following shows the required key operation to input this example using the key.

d≈+eY=fcc≈-dY=-i e≈,Yw

•To input simultaneous equations with three or more unknowns, press the key when

the cursor is in the Exp-N/Eq-N input field. Each press of will add one more line for input of an equation.

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