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STALIN [3.7K]
3 years ago
8

1.

Mathematics
1 answer:
ASHA 777 [7]3 years ago
8 0

Answer:

1)

x = 1

y = -3

2)

x = 3 or x = -3

Step-by-step explanation:

1)

System of equations, we plug in y to the second equation

4x + 2(4x-7) = -2\\4x+8x-14 = -2\\12x = 12\\x=1

We then plug x back into the first equation to find y

y = 4(1) -7\\y = -3

2)

4x^2 +3=39\\4x^2=36\\x^2=9\\x=3, -3

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Answer:

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3 0
3 years ago
What's 17= z- (-9) days
Arte-miy333 [17]
Z - (-9) is the same as z + 9. Subtracting a negative is the same as adding.

Therefore 
17 = z - (-9)
is the same as
17 = z + 9

To get 'z' all by itself, we need to subtract 9 from both sides. We subtract 9 from both sides to undo the "plus 9" occurring to the 'z' on the right side.

17 = z + 9
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z = 8

So the answer is z = 8

---------------------------

Check:

17 = z - (-9)
17 = 8 - (-9) ... replace z with 8
17 = 8 + 9
17 = 17
Answer checks out


4 0
4 years ago
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emmainna [20.7K]

Answer:

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Hope this helps you.

3 0
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