Question

Please help serious answers only

Answer 1

52

Explanation:

X=10x =10

means here value of X is 1

y = 4y = 4

means here value of y is also 1

now substitute the values of X and y in the equation

8×1-7×1×(8×1-7×1)

8-7(8-7)

64-49

15

Answer 2

Are you serious? This is so easy bro
Plug in 10 for x and 4 for y
8(10) - 7(4) = 56