A + B = 13
A - B = 5
- Which letter has a bigger value?
- What is the total value?
- Find B.
- Find A.
(a)
A - B = 5
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 + 5
Total
= 1 u + 1 u + 5
= 2 u + 5
2 u + 5 = 13
2 u = 13 - 5 = 8
1 u = 8 ÷ 2 = 4
B = 4
(d)
A
= 1 u + 5
= 4 + 5
= 9
Answer(s): (a) A; (b) 13, (c) 4; (d) 9