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dolphi86 [110]
3 years ago
12

May someone help me with these 2

Mathematics
1 answer:
dimaraw [331]3 years ago
6 0

Step-by-step explanation:

\begin{align}7x-y-z-x-y+z&=(7x-x)+(-y-y)+(-z+z)]]\\&=6x-2y\\&=6\cdot(2)-2\cdot(-4)\\&=20\end{align}

\begin{align}5x-2xy+4y-3y+2x-z+3xy&=(5x+2x)+(4y-3y)-z+(-2xy+3xy)\\&=7x+y-z+xy\\&=7(2)+(-4)-(5)+(2)(-4)\\&=14-4-5-8\\&=-3\end{align}

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