If 4(a – b) = 16, 8(a + b) = 64. Find the value of ab.
1). 0
2). 1
3). 2
4). 8
We know that 4(a – b) = 16, 8(a + b) = 64
⇒ 22(a – b) = 24
⇒ 23(a + b) = 26
2a – 2b = 4 and 3a + 3b = 6
⇒ a – b = 2, a + b = 2
On solving, a = 2, b = 0
∴ ab = 20 = 13. Solve the following equations: (7x + 3y = 44) and (x + 5y = 20)
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