In PTC Mathcad Prime, you can solve linear, non-linear, and differential systems of equations.

PTC Mathcad has a few methods that we can use:

To solve linear systems of equations, we work with a built-in solving function, lsolve, to quickly find the solution.

### The Solve Block

To solve both linear and non-linear systems of equations, we use the Solve Block feature, which is an extremely powerful and flexible construct.

The Solve Block can be found in the Math tab, and it contains three different sections:

Then outside of the Solve Block, evaluate the vector or individual variables to see the solutions.

The Solve Block is a special structure within Mathcad. In addition to solving systems of equations, it can be used to perform optimisations – finding the minimum or maximum for a function and differential equations.

In addition, it is a great feature to use in reporting, as the reader can easily follow the calculation flow and is presented with a full picture of the calculations.

#### Another example

The non-linear system of equations is represented on a graph in the below example, where we can see the intersection points.

In the example, we have inserted a solve block from the Math tab, and we type in the initial values, along with the constraints, which are limits for what we want to calculate.

Once you understand the solve block structure, you will feel confident in applying solve blocks engineering design problems when solving, for instance, a minimum pipe diameter to produce a given flow.

### Symbolic Solving

Sometimes when we have an equation or a system of equations, instead of solving them numerically, we want to solve them symbolically. We can do this using the Symbolic Evaluation operator and the solve keyword. After selecting the solve keyword, type in a comma followed by the variables that you want to solve symbolically: