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oee [108]
3 years ago
9

A student is using the elimination method to solve the system of equations below. What is the best first

Mathematics
1 answer:
vlada-n [284]3 years ago
7 0

Answer:

The best first step would be to multiply the second equation by -2

Step-by-step explanation:

The best first step would be to multiply the second equation by -2

then you would have the following

\ \ \ \ \ \  4x - 5y = 2 \\-2*(2x)+ (-2)*y = (-2)*3

and when you multiply it is easy to eliminate because you will get

   4x - 5y = 2 \\-4x -2y = 6

and if you sum the equations you get

-7y = 8

so that is a single variable equation which is easier to solve.

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The total mass of 4 identical pencil boxes and a notebook is 700 g. each pencil box has a mass of 140 g. what is mass of the not
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2 years ago
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3 years ago
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4)^-5 write in a simplified fraction
erastova [34]
\bf 4^{-5}?\qquad \textit{well, bear in mind that}\\
----------------------------\\
a^{-{ n}} \implies \cfrac{1}{a^{ n}}\qquad \qquad

\cfrac{1}{a^{ n}}\implies a^{-{ n}}
\\ \quad \\
%  negative exponential denominator
a^{{ n}} \implies \cfrac{1}{a^{- n}}
\qquad \qquad 

\cfrac{1}{a^{- n}}\implies \cfrac{1}{\frac{1}{a^{ n}}}\implies a^{{ n}}\\
----------------------------\\
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