A + B = 13
A - B = 3
- Which letter has a bigger value?
- What is the total value?
- Find B.
- Find A.
(a)
A - B = 3
So, A is has a bigger value than B.
(b)
A + B = 13
So, the total value is 13.
(c)
B = 1 u
A = 1 u + 3
Total
= 1 u + 1 u + 3
= 2 u + 3
2 u + 3 = 13
2 u = 13 - 3 = 10
1 u = 10 ÷ 2 = 5
B = 5
(d)
A
= 1 u + 3
= 5 + 3
= 8
Answer(s): (a) A; (b) 13, (c) 5; (d) 8