Question

217x+131y=913,131x+217y=827

Answer 1

y=913-217x------1

131x+217(913-217x)=827
131x+198121-47089x=827
-36958x=-197294
=> x=5.33
y= 913-217(5.33)
y= -243.6

Answer 2

by adding equation (I) and( ii)
(217+131)x+(131+217)y=913+827
348x+348y=1740----(---1)
by subtracting equation I and ii
86x-86y=86 ----------(2)

348x+348y=1740
86x-86y=86
=) 348(x+y)=1740
=)x+y=5 ---------(3)
0r
86(x-y)=86
=)x-y=1 ---------(4)

by elimination method to solving equation 3 and 4
x+y=5
x-y=1
multiply 1 to equation 3 and 4
x+y=5
x-y=1
______
2y=4
y=4/2=2
((((((((( y=2. )))))

put the value of y in an other equation........
x-y=1
x-2=1
x=3