nycalessandro
nycalessandro
08-05-2016
Mathematics
contestada
please help me in answers 6 and 8
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SmarticalParticals
SmarticalParticals
08-05-2016
For #6
x + y = -10
x - y = 2
First solve for y in one of the equations
x - y = 2
-y = 2 - x
y = -2 + x
y = x - 2
Now substitute into one of the equations and solve for x
x + y = -10
x + x - 2 = -10
2x - 2 = -10
2x = -8
x = -4
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