Solve for x and y
x+y=5
x−y=a

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x = (5+a)/2

y = (5-a)/2

Step-by-step explanation:

x+y=5

x−y=a

Add the two equations together

x+y=5

x−y=a

2x = 5+a

Divide each side by 2

2x/2 = (5+a)/2

x = (5+a)/2

Multiply the second equation by -1  -x+y = -a

Then add the two equations together

x+y=5

-x+y=-a

 2y = 5-a

Divide each equation by 2

2y/2 = (5-a)/2

y = (5-a)/2

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step-by-step explanation:

16.9 times 2.85

step-by-step explanation: