Question

which equation together with x+y=1 forms a system that has a solution of (-3,4)
A)y=x
B) x-y=1
C)y=x=7
D) -3x+4y=1
I think the answer choice is d by sub in the numbers of -3for x and 4fory
no. You want the equation which is true of you sub in -3 and 4.

-3x+4y = -3(-3)+4(4) = 9+16 = 25

Substitute the values for x and y into the other equations and see which produces the result on the right.

For example, it is not A, because that would become

4 = -3

Plus, it might be easier if you fix the typo in C.

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