Solve the system by substitution.
-4x-y=1
-9x+9=y
1 answer:
Answer:Add
9
to both sides of the equation.
x
=
y
+
9
x
+
y
=
6
Replace all occurrences of
x
with
y
+
9
in each equation.
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2
y
+
9
=
6
x
=
y
+
9
Solve for
y
in the first equation.
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y
=
−
3
2
x
=
y
+
9
Replace all occurrences of
y
with
−
3
2
in each equation.
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x
=
15
2
y
=
−
3
2
The solution to the system is the complete set of ordered pairs that are valid solutions.
(
15
2
,
−
3
2
)
The result can be shown in multiple forms.
Point Form:
(
15
2
,
−
3
2
)
Equation Form:
x
=
15
2
,
y
=
−
3
2
image of graph
Step-by-step explanation:
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Answer:
a = 16
Step-by-step explanation:
inversely proportional
y = k/x
a = k/b
5 = k/4
solve for k
multiply by 4 on each side
20 =k
a = 20b
if b = 4/5
a = 20 * 4/5
a = 16
Answer:
27
Step-by-step explanation:
13
1
2
1
2
=
27
2
1
2
=27
=27
Answer:
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Step-by-step explanation:
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Answer: -2√7
Step-by-step explanation:
Hello!
First you have to make the denominators the same
1/4 = 6/24
1/6 = 4/24
Now you add
1 6/24 + 5 4/24 = 6 10/24
This can be simplified to 6 5/12
The answer is 6 5/12
Hope this helps!
