Question

? + ? = 8
+ +
? - ? = 6
" "
13 8​

Answer 1

Answer:

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Answer 2

We can form four equations

A+B = 8

C-D = 6

A+C = 13

B+D = 8

Let�¢??s solve these four equations and find the variables A, B, C & D

if we add the four equations

A+B+C-D+A+C+B+D = 8 + 6 + 13 + 8

2(A+B) + 2C = 35

2C = 35 - 2*8 (by replacing A+B)

2C = 35 - 16 = 19

C = 9.5

from 2nd Equation C - D = 6

D = C - 6

D = 9.5 - 6

D = 3.5

from 3rd equation

A+C = 13

A = 13 - C

A = 13 - 9.5

A = 3.5

from 4th equation

B + D = 8

B = 8 - D

B = 8 - 3.5

B = 4.5