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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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Step-by-step explanation:

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7 0
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Write an equation of the line that is perpendicular to 3x + 9y = 7 and passes through the point (6, 4).
musickatia [10]
Hi there!

The equation of any line perpendicular to
ax + by = c
is
bx - ay = c

Therefore, in this situation, the formula of the line would be
9x - 3y = c

Given that the line passes through the point (6, 4) we get
9 \times 6 - 3 \times 4 = c
54 - 12 = c
c = 44

Therefore, the equation of the line that is perpendicular to 3x + 9y = 7 and passes through (6, 4) is
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3 years ago
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