Question

if 11x+12y=30 and 12x+11y=16 , x+y= ?​

Answer 1

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Answer 2

Answer:

11x+12y=30..eq(1)

12x+11y=16

12x=16-11y

x=16-11y/12 ....eq(2)

substituting x by 16-11y/12 in eq(1)

11(16-11y/12)+12y=30

176-121y/12+12y=30

176-121y+144y/12=30

176+23y=30x12

23y=360-176

y=184/23

y=8

putting y=8 in eq(1)

11x+12x8=30

11x=30-96

11x=-66

x=-6

x+y=-6+8

x+y=2