Q3
3y +5
Solve for y:
2y +7
4.
Answers
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Step-by-step explanation:
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Algebra Examples
Popular Problems Algebra Solve by Substitution 3x-2y=7 , x+3y=-5
3
x
−
2
y
=
7
3x-2y=7 ,
x
+
3
y
=
−
5
x+3y=-5
Subtract
3
y
3y from both sides of the equation.
x
=
−
5
−
3
y
x=-5-3y
3
x
−
2
y
=
7
3x-2y=7
Replace all occurrences of
x
x in
3
x
−
2
y
=
7
3x-2y=7 with
−
5
−
3
y
-5-3y.
x
=
−
5
−
3
y
x=-5-3y
3
(
−
5
−
3
y
)
−
2
y
=
7
3(-5-3y)-2y=7
Simplify
3
(
−
5
−
3
y
)
−
2
y
3(-5-3y)-2y.
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Simplify each term.
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x
=
−
5
−
3
y
x=-5-3y
−
15
−
9
y
−
2
y
=
7
-15-9y-2y=7
Subtract
2
y
2y from
−
9
y
-9y.
x
=
−
5
−
3
y
x=-5-3y
−
15
−
11
y
=
7
-15-11y=7
Solve for
y
y in the second equation.
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x
=
−
5
−
3
y
x=-5-3y
y
=
−
2
y=-2
Replace all occurrences of
y
y in
x
=
−
5
−
3
y
x=-5-3y with
−
2
-2.
x
=
−
5
−
3
⋅
−
2
x=-5-3⋅-2
y
=
−
2
y=-2
Simplify
−
5
−
3
⋅
−
2
-5-3⋅-2.
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