A + B = 8
A - B = 4
- Which letter has a bigger value?
- What is the total value?
- Find B.
- Find A.
(a)
A - B = 4
So, A is has a bigger value than B.
(b)
A + B = 8
So, the total value is 8.
(c)
B = 1 u
A = 1 u + 4
Total
= 1 u + 1 u + 4
= 2 u + 4
2 u + 4 = 8
2 u = 8 - 4 = 4
1 u = 4 ÷ 2 = 2
B = 2
(d)
A
= 1 u + 4
= 2 + 4
= 6
Answer(s): (a) A; (b) 8, (c) 2; (d) 6