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Mathematics, 23.07.2019 15:00 svandygriff6

Asap 1. if 7a+3b=20 and 3a+7b=10, then what is the value of a+b? 2. if 9x+2y^2−3z^2=132 and 9y−2y^2+3z^2=867, then x+y = 3. if 9x+2y^2−3z^2=132 and 9y−2y^2+3z^2=867, then x-y =

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Asap 1. if 7a+3b=20 and 3a+7b=10, then what is the value of a+b? 2. if 9x+2y^2−3z^2=132 and 9y−2y^2...

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