<span>System 1 and system 2, because the second equation in system 2 is obtained by adding the first equation in system 1 to two times the second equation in system 1
This is the correct answer because not only is it true but it also follows the property of solving systems of equations with adding the equations. To prove that it is true:
2nd equation in system #2 = 1st equation in system #1 + 2(2nd equation in system #1)
</span>10x − 7y = 18 == 4x − 5y = 2 + 2(<span>3x − y = 8)
10x - 7y = 18 == 4x - 5y = 2 + 6x - 2y = 16
10x = 7y = 18 == 10x - 7y = 18</span>
i believe it is 645, 500 !
I'll assume you're supposed to compute the line integral of 
over the given path 
. By the fundamental theorem of calculus,
so evaluating the integral is as simple as evaluting 
at the endpoints of . But first we need to determine given its gradient.
We have
Differentiating with respect to 
gives
and we end up with
for some constant . Then the value of the line integral is 
.
