Question

Solve the following system.
x − y = 10
x + y = 4

(−3, 7)

(−7, 3)

(7, 3)

(7, −3)

Answer 1

(7, -3)

Answer 2

add both equations
x − y = 10
x + y = 4
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2x=14
x=14/2
x=7

now plug x value into one of the equation

7+y=4
y=4-7
y=-3

so x=7 and y=-3