Question 701038
(1)/(3)X+(1)/(5)Y=7 MULTIPLY BY 2 & ADD.
(1)/(6)X-(2)/(5)Y=-4
(2)/(3)X+(2)/(5)Y=14 ADD.
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(1/6+2/3)X=14-4
(1/6+4/6)X=10
(5/6)X=10
5X/6=10 CROSS MULTIPLY
5X=10*6
5X=60
X=60/5
X=12 ANS.
(1/3)12+(1/5)Y=7
4+Y/5=7
Y/5=7-4
Y/5=3
Y=15 ANS.
PROOF:
(1)/(3)*12+(1)/(5)*15=7
4+3=7
7=7