Anyone know the answer? Also could you put down what equation I’m supposed to use?

Answer:
The bottom two are your answers.
Step-by-step explanation:
What you do is use the slope formula which is y_2-y_1/x_2-x_1.
So for PQ it will be 12(which is y_2)-6(which is y_1)/4(which is x_2)-5(which is x_1) which equals -6.
12-6/4-5=-6.