A + B = 7
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 = 7
So, the total value is 7.
(c)
B = 1 u
A = 1 u + 3
Total
= 1 u + 1 u + 3
= 2 u + 3
2 u + 3 = 7
2 u = 7 - 3 = 4
1 u = 4 ÷ 2 = 2
B = 2
(d)
A
= 1 u + 3
= 2 + 3
= 5
Answer(s): (a) A; (b) 7, (c) 2; (d) 5