How to plot separately figures?

I want to plot a second figure with 2x1 subplot, the first subplot must contain both x (original signal) and xn(noise added signal), and second subplot must contain x (original signal) and y(filtered signal). What should I change ?

fs = 5000;

tiv=1/fs;

t = 0:tiv:0.05;

t1=2*pi*100*t;

t2=2*pi*500*t;

x = sin(t1)+0.7*cos(t2);

xn = x + 5.*randn(size(t));

originalSpectrum = fft(x);

noisySpectrum = fft(xn);

xdb=mag2db(originalSpectrum);

xndb=mag2db(abs(noisySpectrum));

figure(1)

subplot(2, 1, 1);

plot((xdb),'b-', 'LineWidth', 2);

xlabel('Frequency (Hz)')

ylabel('Magnitude(dB)')

title('Original Signal (No Noise)')

subplot(2, 1, 2);

plot(abs(xndb), 'b-', 'LineWidth', 2);

xlabel('Frequency (Hz)')

ylabel('Magnitude(dB)')

title('Noisy Signal')

d = designfilt('lowpassfir', 'PassbandFrequency', 500, ...

'StopbandFrequency', 600, ...

'PassbandRipple', 1, 'StopbandAttenuation', 100, ...

'SampleRate', fs);

y=filter(d,x);

figure(2)

subplot(2,1,1);

plot(x); hold on; plot(xn);

subplot(2,1,2);

plot(x); hold on; plot(y);

[Jaya]

What is the problem you are facing? Please state it. Because the code is producing the graphs.

Answer 1

[Sulaymon Eshkabilov]

Here are the plot parts as you were aiming to get:

...
subplot(2,1,1);
plot(t, x, 'b', t, xn, 'r'); grid on
legend('Original Signal', 'Noise Added Signal')
ylabel('Signal')
subplot(2,1,2);
plot(t, x, 'b', t, y, 'r');
legend('Original Signal', 'Filtered Signal', 'location', 'southwest')
ylabel('Signal'), xlabel('Time')

Good luck