Solve for x and y
3x+2y=12
12x+8y=48

x=2 and  y=3

Step-by-step explanation:

3x+2y=12

3(2) + 2(3)

6 + 6 = 12

12x+8y=48

12(2) + 8(3)

24+24=48

7 and 4

Step-by-step explanation:

Let the number of hours Donnell practiced be d

and the number of hours Marcus practiced be m.

We can set up a system of equations.

d = m + 3

m + d = 11

Substitute the value of d that's in the first equation, into the second equation.

m + (m + 3) = 11

2m + 3 = 11

2m = 8

m = 4

Marcus practiced for 4 hours. Since Marcus and Donnell, together, practiced 11 hours, Donnell practiced for 11-4=7 hours.