int funkcja_liniowa(int a, int b)
{
	float w_y;
	cout << "Wykres funkcji liniowej (y=ax+b)" << endl;
	for (int y = 15; y >= -15; y--)
	{
		for (int x = -50; x <= 50; x++)
		{
			w_y = a*x + b;
			if (w_y == y)
				cout << "x";
			else if (x == 0 && y == 0)
				cout << "+";
			else if (y == 0)
				cout << "-";
			else if (x == 0)
				cout << "|";
			else
				cout << " ";
		}
		cout << endl;
	}
	return 0;
}