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olganol [36]
3 years ago
14

Expand & simplify(9x - y) (9x + y)​

Mathematics
1 answer:
grandymaker [24]3 years ago
5 0

Answer:

81x^{2}- y^{2} this is the answer

Step-by-step explanation:

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Solve the system of equations. \begin{aligned} & -10x+3y = 5 \\\\ & x=y-4 \end{aligned} ​ −10x+3y=5 x=y−4 ​
Ksenya-84 [330]

Answer:

x = 1

y = 5

Step-by-step explanation:

You can use either substitution or elimination for this problem. I will use substitution.

Step 1: Replace x in the 1st equation

-10(y-4) + 3y = 5

-10y + 40 + 3y = 5

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Step 2: Plug <em>y </em>into an original equation to find <em>x</em>

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x = 1

And you have your final answers!

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3 years ago
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