Can someone help me and give me an explanation?

An ulcer medication has 300 milligrams in 2 tablets. how many milligrams are in 3 tablets?

An unknown number x is at most 10. which graph best represents all the values of x? number line graph with closed circle on 10 and shading to the right. number line graph with open circle on 10 and shading to the right. number line graph with open circle on 10 and shading to the left. number line graph with closed circle on 10 and shading to the left.

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?