How do you solve this system of equations: #y= 1x - 18 and y = - 7x + 15#?

1 Answer
sankarankalyanam
Oct 16, 2017

#x=11/2, y=-47/2#

Explanation:

#x+y = -18 color (white)(aaa)# Eqn (1)
#7x+y= 15 color (white)(aaa)# Eqn (2)
Subtracting (1) from (2) and solving for x,
#6x = 33, x = 11/2#
Substituting in (1), we get
#(11/2)+y = -18#
#2y=-36-11, y = -47/2#

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