Simultaneous Equations

Question 1:

3x 7y = -31 3x +5y = -1
x=-4.5 y=2.5

Question 2:

6x +y = -24 6x 6y = -45
x=-4.5 y=3

Question 3:

8x +8y = 16 3x 8y = -71
x=-5 y=7

Question 4:

5x +y = 17 3x +7y = 39
x=2.5 y=4.5

Question 5:

6x 4y = 1 8x y = 23
x=3.5 y=5

Question 6:

5x y = 20 3x 7y = -52
x=6 y=10