Question

find the value of x and y in 2 ^2x-y =64,2^5x+y=256

Answer 1

Answer:

x = 2

y = (-2)

Step-by-step explanation:

2^2x-y = 64

2^2x-y = 2^6

therefore;

2x-y = 6 》[1]

2^5x+y = 256

2^5x+y = 2^8

therefore;

5x+y = 8 》[2]

[1]+[2];

2x-y + 5x+y = 6 + 8

7x = 14

x = 14/7

x = 2

x=2, substitution by [1]

2x-y = 6

2(2)-y = 6

4-y = 6

4-6 = y

y = (-2)