Use elimination to solve each system of equations. 1. x + y = 4 x – y = 7

Step-by-step explanation:

1(x+y=4)

-1(x-y=7)

x+y=4

-x+y=-7

x-x=4-x

-x=x=-7+x

4-x=-7+x

4-x-x=-7

4-2x=-7

-2x=-7-4

-2x/-2=-11/-2

x=5.5

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the anwser is d) 75°

step-by-step explanation: