3 years ago

OKAY I NEED SOMEONE SMART TO HELP ME

Mathematics

1 answer:

Contact [7]3 years ago

3 0

B. A deposit of $278 followed by a withdrawal of $278

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Which expressions are quadratic expressions? Check all that apply.

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Answer:

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Step-by-step explanation:

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3x-4y= 3x−4y= \,\,9 9 -5x+4y= −5x+4y= \,\,-23 −23

Marta_Voda [28]

Answer: (7,3)

Step-by-step explanation:

[Please check]: I decoded the equations as follows:

3x-4y=9 and −5x+4y=-23

We can solve this by either of two methods: Algebra and graphing.

Algebra:

Add the two equations:

3x-4y=9

−5x+4y=-23

-2x = -14

x = 7

Use x=7 to solve for y:

3x-4y=9

3(7)-4y=9

21 -4y = 9

-4y = -12

y = 3

----

The solution is (7,3)

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Graphing:

See the attached graph. The lines intersect at (7,3)

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