for simultaneous equation 3x + 4y = 7 , 4x + 3y = 5 . Find the value of x+y
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Step-by-step explanation:
3x+4y=7
3x=7-4y
*x=7/3-4y-3*
4x+3y=5
4(7/3-4y/3)+3y=5
28/3-16y/3+3y=5
28-16y+9y/3=5
28-16y+9y=15
-7y=15-28
y=13/7
3x+4(13/7)=7
3x+52/7=7
21x+52/7=7
21x+52=49
21x=-3
x=-1/7
x+y=
-1/7+13/7
12/7
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