Converting Standard Form Equations To Slope Intercept Form

    public static String StandardToSlope(String Function) {
        //lets loop until we find our x value
        char[] Characters = Function.toLowerCase().replace(" ", "").toCharArray();
        int xIndex = 0;
        for (int i = 0; i < Characters.length; i++) {
            if (Characters[i] == 'x') {
                xIndex = i;
                break;
            }
        }  
        String xValue = "";
        if (Characters[0] == '-') {
            xValue += "";
        }
        else {
            xValue += "-";
        }
        Vector<String> xValues = new Vector<String>();
        try {
            for (int i = xIndex-1; i >= 0; i--) {
                if (IsNumeric(String.valueOf(Characters[i]))) {
                    xValues.add(String.valueOf(Characters[i]));
                }
            }
        }
        catch (Exception ex) { 
            //do nothing
        }
        for (int i = xValues.size()-1; i >= 0; i--) {
            xValue+=xValues.get(i);
        }
        
        
        
        //now we do the same as above except to get the y
        int yIndex = 0;
        for (int i = 0; i < Characters.length; i++) {
            if (Characters[i] == 'y') {
                yIndex = i;
                break;
            }
        }  
        String yValue = "";
        Vector<String> yValues = new Vector<String>();
        try {
            for (int i = yIndex-1; i >= 0; i--) {
                if (IsNumeric(String.valueOf(Characters[i]))) {
                    yValues.add(String.valueOf(Characters[i]));
                }
                if (Characters[i] == '-' || Characters[i] == '+') {
                    if (Characters[i] == '-') {
                        yValue="-";
                    }
                    break;//reached end of y
                }
            }
        }
        catch (Exception ex) { 
            //do nothing
        }
        for (int i = yValues.size()-1; i >= 0; i--) {
            yValue+=yValues.get(i);
        }
        
        
        
        //lets get the final number
        int equalsIndex = Function.replace(" ", "").indexOf("=");
        String FinalNumber = "";
        for (int i=equalsIndex+1; i < Characters.length; i++) {
               FinalNumber += String.valueOf(Characters[i]);
        }
        if (IsNumeric(String.valueOf(FinalNumber.charAt(0)))) {
            FinalNumber = "+" + FinalNumber;
        }
        
        
        
        //finish it up then return
        double finalXValue = Double.parseDouble(xValue)/Double.parseDouble(yValue);
        double finalFinalNumber = Double.parseDouble(FinalNumber)/Double.parseDouble(yValue);
        String Oper = (IsNegative(finalFinalNumber)) ? "" : "+";
        //String finalFinalFinalNumber = 
        return "y="+finalXValue+"x"+Oper+finalFinalNumber;
    }
    
    //checks if a string is a single numerical character
    //i know it is not the best for normal use
    //but good for this function
    public static Boolean IsNumeric(String Value) {
        Boolean returns = false;
        if (Value.contains("0") || Value.contains("1") || Value.contains("2") || Value.contains("3") || Value.contains("4") || Value.contains("5") || Value.contains("6") || Value.contains("7") || Value.contains("8") || Value.contains("9")) {
            returns = true;
        }
        return returns;
    }
    
    //checks if a double is negative
    public static Boolean IsNegative(double value) {
        if (value < 0) {
            return true;
        }
        else {
            return false;
        }
    }