The LCM of two prime numbers is generally just their product, since they share no common factors.
3 and 7 are both prime numbers, so their LCM (least common multiple) is simply the numbers multiplied together. In this case, the LCM is thus 21.
Answer:
Solid Line, Shade Above
Explanation:
Given:

The second inequality in the system is:

The intercepts of the boundary line (y=x-4) are (0, -4) and (4,0).
Since the inequality has an equal to sign attached, we use a solid line.
At (0,0)

Since the inequality 0≥-4 is true, shade the side that contains (0, 0) as shown in the graph below:
So, we use a solid line and shade above the boundary line.
Are you trying to solve the whole problem
No the rectangle cannot have x = 60 and y = 11 because x = 48 + 2y