Question

Which expression has a value of 36 when x=4 and y=7 A. 2xy B. 2x+4y C. 6y-x D. 12x-2y

Answer 1

So subsitute
x=4y=7
A. 2xy=2 times 4 times 7=2 times 28=56 not 36
B. 2x+4y=2 times 4+4 times 7=8+28=36 true

the answer is B

Answer 2

The answer is b, because 2x4 is 8, 4x7 is 28 and 8+28+36