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If w, x, y, and z are real numbers satisfying:

w + x + y = -2

w + x + z = 4

w + y + z = 9

x + y + z = 2

what is wx + yz?

 Jul 9, 2022
 #1
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Nice problem! 
Adding all the equations gives us

 

3(w + x + y + z) = 13

w + x + y + z = 13/3

 

The first equation becomes(Can you see how I did this?):

(w + x + y + z) - z = -2

 

Doing this step and solving the other variables, can you continue from here? 

 Jul 9, 2022
 #2
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Now solve this https://web2.0calc.com/questions/need-help-with-this_18

Guest Jul 9, 2022

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