Kayla is using 492 meters of a string when she is done there is 49 meters left then Ella gives kayla 3 times more than she has now Ella has 42 meters now how much did Ella give and is it greater than Kayla's total

196 meters,  it is not greater than Kayla's total.

Step-by-step explanation:

Given:

Kayla is using 492 meters of a string when she is done there is 49 meters  left.

Ella gives Kayla 3 times more than she has now.

To find:

How much did Ella give and is it greater than Kayla's total ?

Solution:

Kayla has now ( after using 492 meters of a string ) = 49 meters

Ella gives Kayla 3 times more than Kayla has now means,

Therefore, Ella gave 196 meters string to Kayla.

Now, to find that is it greater than Kayla's total,

Kayla's total length of string = 492 + 49 = 541 meters

Kayla's total length of string is 541 meters while Ella gave 196 meters string to Kayla which is less than Kayla's total.

Thus, it is not greater than Kayla's total.

Answer

Both are correct.

Explanation
The both equations are the same.
When we say that y=x+10, we can make x the subject of the formula and get;
y=x+10
y-10=x
x=y-10.

If the substitution is done correctly, that is x+10 for y and y-10 for x in the other equation then, both would be correct.