Answer:
(-1,2)
Step-by-step explanation:
Write out the system in a matrix
3 5 7
2(6 -1 -8 ) Multiply row two by five and add to row one.
1 0 -1 Multiply row 1 by -6 and add it to row two.
6 -1 -8
1 0 -1
0 -1 -2 Multiply bottom row by -1
1 0 -1
0 1 2
x=-1, y=2
