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aleksandr82 [10.1K]
3 years ago
11

PLEASE HELP

Mathematics
1 answer:
horsena [70]3 years ago
5 0
X=6 y=-4


Step: Solve
−
3
x
−
9
y
=
18
for x:
−
3
x
−
9
y
=
18
−
3
x
−
9
y
+
9
y
=
18
+
9
y
(Add 9y to both sides)
−
3
x
=
9
y
+
18
−
3
x
−
3
=
9
y
+
18
−
3
(Divide both sides by -3)
x
=
−
3
y
−
6

Step: Substitute
−
3
y
−
6
for
x
in
4
x
+
3
y
=
12
:
4
x
+
3
y
=
12
4
(
−
3
y
−
6
)
+
3
y
=
12
−
9
y
−
24
=
12
(Simplify both sides of the equation)
−
9
y
−
24
+
24
=
12
+
24
(Add 24 to both sides)
−
9
y
=
36
−
9
y
−
9
=
36
−
9
(Divide both sides by -9)
y
=
−
4

Step: Substitute
−
4
for
y
in
x
=
−
3
y
−
6
:
x
=
−
3
y
−
6
x
=
(
−
3
)
(
−
4
)
−
6
x
=
6
(Simplify both sides of the equation)

Answer:
x
=
6
and
y
=
−
4
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