How do you solve the system of equations #8x-5y = -17# and #-2x + y = 6#?

1 Answer
Jan 28, 2016

Answer:

# x = -13/2 " " y = -7 #

Explanation:

You have
1. #" " 8x−5y =−17#
2. # −2x+y= " "6 # Multiple this function by 4 and add to the two functions
3. #" " 8x−5y =−17#
4. # −8x+4y= " "24 #
#--------#
5. #" " 0−y = 7; y = -7# insert the value of y to any equation, let's use 2:

#" " -2x - 7 = 6; x = -13/2#

You can use a Matrix equation...