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Helen [10]
3 years ago
13

-3x+3y=9 2x−7y=−14 ​

Mathematics
1 answer:
nignag [31]3 years ago
6 0
Step: Solve
−
3
x
+
3
y
=
9
for x:
−
3
x
+
3
y
=
9
−
3
x
+
3
y
+
−
3
y
=
9
+
−
3
y
(Add -3y to both sides)
−
3
x
=
−
3
y
+
9
−
3
x
−
3
=
−
3
y
+
9
−
3
(Divide both sides by -3)
x
=
y
−
3

Step: Substitute
y
−
3
for
x
in
2
x
−
7
y
=
−
14
:
2
x
−
7
y
=
−
14
2
(
y
−
3
)
−
7
y
=
−
14
−
5
y
−
6
=
−
14
(Simplify both sides of the equation)
−
5
y
−
6
+
6
=
−
14
+
6
(Add 6 to both sides)
−
5
y
=
−
8
−
5
y
−
5
=
−
8
−
5
(Divide both sides by -5)
y
=
8
5

Step: Substitute
8
5
for
y
in
x
=
y
−
3
:
x
=
y
−
3
x
=
8
5
−
3
x
=
−
7
5
(Simplify both sides of the equation)

Answer:
X=-7/5 and y= 8/5
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Contact [7]

Answer:

x = -1

y = -3 or

x = -3

y = -5

Step-by-step explanation:

-1 - (-3) =

-1 + 3 = 2

-3 - (-5) =

-3 + 5 = 2

8 0
4 years ago
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den301095 [7]

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Step-by-step explanation:

Given

prism were changed by a scale factor of 3

Suppose prism is rectangular in shape

So surface are is S.A.=2(lw+wb+lb)

Where l=length

w=width

b=breadth

So new length,breadth and width is

l'=3l

w'=3w

b'=3b

S.A.=2(3\times 3lw+3\times 3wb+3\times 3lb)

S.A.=2\times 3^2(lw+wb+lb)

S.A.=3^2\times 2(lw+wb+lb)

So new surface area would change by a factor of 9

7 0
4 years ago
Which of the following functions is graphed above?
vredina [299]

Answer:

The answer is D ⇒ -4log(-x + 4)

Step-by-step explanation:

From the graph we chose the point of x-intercept (3 , 0)

∵ f(x) = -4log(-x + 4)

∴f(3) = -4log(-3 + 4) = -4log(1)

∵ log(1) = 0

∴f(3) = 0

If x = 0

∴ f(0) = -4log(0 + 4) = -4log4 = -2.40 ⇒ same value on the graph

∴ The answer is (D)

5 0
4 years ago
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nordsb [41]
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8 0
3 years ago
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