Question 806781
Solve each system by addition, if possible
Having trouble understanding this.
x + y = 1
x - y = 7
Do I add it together like this:
x + y = 1
x - y = 7
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2x = 8
Then, This
x = 8/2
x = 4
Find y using the 1st equation
4 + y = 1
y = 1 - 4
y = -3
Check the solutions in the 2nd equation
4 - (-3) =
Minus a minus is plus, therefore
4 + 3 = 7