How do you solve the system #7x + 2y = 11# and #4x-7y = -10# by elimination?

1 Answer
Binayaka C.
Mar 27, 2016

#x=1 , y=2#

Explanation:

#7x+2y=11 (1)#
#4x-7y=-10(2)# Multiplying (1) by 4 and (2) by 7 we get
#28x+8y=44#(3)
#28x-49y= -70# (4) Subtracting (4) from(3) we get #57y=114 or y=2#
putting y=2 in equation(1) we get #7x=7 or x=1# [ans]

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