1.Solve the system using elimination. 4x + 4y = 12
7x - 4y = 10

2.Solve the system using any method
x + y = 1.7
4x + y = 0.8

3.On a team, 8 girls and 6 boys scored a total of 64 points. The difference between the number of points scored by the 8 girls and the number of points scored by the 6 boys is 16. Each girl scored the same number of points and each boy scored the same number of points. Find the number of points scored by each girl and each boy.

4.Sovle the system of equation by the addition method
{2x = 2y + 5
{-6x + 3y = -30

5.Sovle the system by either the addition method or the substitution method
{ 4y = 5x + 20
{3x - 4y = -20