Solve the simultaneous equations?

Question

5x + 4y=0
4x + 5y= -18

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Answer 1 · 2018-05-22T05:47:00

#x=8#
#y=-10#

#5x+4y=0# --- (1)
#4x+5y=-18# --- (2)

From (1),

#5x=-4y#
#x=-4/5y# --- (3)

Sub (3) into (2)

#4times-4/5y+5y=-18#

#-16/5y+5y=-18#

#9/5y=-18#

#y=-18times5/9#

#y=-10# --- (4)

Sub (4) into (3)

#x=-4/5y#

#x=-4/5times-10#

#x=8#