Let A and E be matrices with the following sizes.
A: 3 × 2 E: 2 × 3
If defined, determine the size of the matrix
E − 2A.

(If an answer is undefined, enter UNDEFINED.)
[ ] x [ ]

If not defined, explain why.

a. E − 2A is defined
b. E − 2A is not defined because E and 2A have different sizes.
c. E − 2A is not defined because E and 2A have the same size.
d. E − 2A is not defined because the number of columns of E does not equal the number of rows of 2A.
e. E − 2A is not defined because the number of rows of E does not equal the number of columns of 2A.

Ok here we go ..there are plenty of ways to solve such math problems but we will go for the smartest and easiest ..5x+2y=7  -2x+6y=9we rearrange them into the following ..by multiplying the 1st equation by 2 it becomes 10x + 4y = 14we rearrange it and so it becomes 10x = 14 - 4yas for the second equation we multiply it by 5 and rearrange it so it becomes as to the following ..-10x + 30y = 45rearranging so 10x = 30y -45now 10x equals both 14 - 4y and 30y -45so   14 - 4y = 30y -4531 = 26yy= 31/26 = 1.19 or around 1.2so by now we can calculate x easily as  -2x+6y=9so 2x = 6y -9 = 6 * 31/26 - 9 = -1.84  then x = - 0.92 or around -0.9best luck!