# PHP Exercises: Print the values of x, y where a, b, c, d, e and f are specified

## PHP: Exercise-49 with Solution

Write a PHP program which solve the equation:

ax+by=c

dx+ey=f

Print the values of x, y where a, b, c, d, e and f are given.

**Input:**

a,b,c,d,e,f separated by a single space.

(-1,000 ≤ a,b,c,d,e,f ≤ 1,000)

**Sample Solution: **

**PHP Code:**

```
<?php
// Function to convert an input to a float
function to_f($e) {
return (float)$e;
}
// Read input from standard input (STDIN) line by line
while ($line = fgets(STDIN)) {
// Explode the line into an array using space as the delimiter
$a = explode(" ", $line);
// Convert each element of the array to a float using the "to_f" function
$a = array_map("to_f", $a);
// Calculate the values of x and y using the provided formulas
$x = ($a[2] * $a[4] - $a[1] * $a[5]) / ($a[0] * $a[4] - $a[3] * $a[1]);
$y = ($a[2] * $a[3] - $a[0] * $a[5]) / ($a[1] * $a[3] - $a[0] * $a[4]);
// Print the values of x and y with three decimal places
print("Values of x and y:\n");
printf("%.3f %.3f\n", $x, $y);
}
?>
```

**Explanation:**

**Function Definition:**- A function to_f($e) is defined, which converts its input to a float using (float)$e.
**Reading Input:**- A while loop reads input from standard input (STDIN) line by line using fgets(STDIN).
**Processing Input:**- Each line read is split into an array of strings using explode(" ", $line), using space as the delimiter.
**Converting Strings to Floats:**- The array_map("to_f", $a) function applies the to_f function to each element of the array $a, converting all elements to floats.
**Calculating Values of x and y:**- The values of x and y are calculated using specific mathematical formulas involving the elements of the array.
**Output:**- The results for x and y are printed with three decimal places using printf("%.3f %.3f\n", $x, $y), preceded by the message "Values of x and y:".

Output:

Values of x and y: -1.684 2.737

**Flowchart: **

**PHP Code Editor:**

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**Previous:** Write a PHP program to check whether three given lengths (integers) of three sides form a right triangle. Print "Yes" if the given sides form a right triangle otherwise print "No".

**Next:** Write a PHP program to compute the amount of the debt in n months.

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