1. solve the system using elimination -4x + 4y = -8 x = 4y = -7 2. what is the solution of the system? write answer in (x, y) form. -8x + 2y = -26 -5x - 5y = -10 3. solve the system using an equivalent system. 3x - 5y = 9 3x - y = -3 4. what are the solutions of the following systems? -x + y = -2 4x - 4y = 8

1. (7.4,3.6)

2. (3,-1)

3. (-2,-3)

4. Infinite number of solutions.

Step-by-step explanation:

We can solve systems of equations 3 ways: graphing, substitution, and elimination. We will solve 1-2, 4 using substitution and 3 with elimination.

1. Since x=4y-7, we substitute it in for x . It's better than elimination because of how it is set-up unless there is a typo.

2.  Since none of the coefficients of x & y are the same, we will rearrange and substitute.

3. We can solve this system through elimination. We subtract or add the equations when the coefficients are the same to eliminate one variable.

4. Since none of the coefficients of x & y are the same, we will rearrange and substitute.

= 5

step-by-step explanation:

to find the 15th term substitute n = 15 into the nth term formula

= (- 3 × 15 ) + 50 = - 45 + 50 = 5