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Kalu
Maths Lessons
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ONLINE MATHEMATICS TUTOR FOR JUNIOR HIGH SCHOOL

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BELOW IS SIMULTANEOUS EQUATION USING SUBSTITUTION METHOD TO SOLVE THE EQUATION, THIS IS THE KIND OF THINGS I WOULD BE TEACHING YOU FOLLOWING SCHEME OF WORK FROM SCHOOLS.
E.G
X + 2Y = 8
2X + 3Y = 15
FIND X AND Y.

SOLUTION
X + 2Y =-(1)
2X + 3Y =-(2)
FROM (1) ABOVE X = 8 - 2Y-(3), SUBSTITUTE AS X IN (2)
: 2X + 3Y =-(2)
2(8 - 2Y) + 3Y = 15
16 - 4Y + 3Y = 15
16 - Y = 15
Y =-: Y = 1.
IN (3) X = 8 - 2Y
: X = 8 - 2 X 1, X =-X = 6.
ANSWER X = 6 AND Y = 1

CHECK
X - 2Y =-+ 2 = 8
2X = 3Y =-+3 = 15
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