Select all of the equations that are equivalent to 3 x − 12 = 19
2 answers:
Answer:
X=2
Step-by-step explanation:
x
=
−
2
Explanation:
Collect terms in x on the left side of the equation and numeric values on the right side.
add 3x to both sides.
5
x
+
3
x
+
12
=
−
3
x
+
3
x
−
4
⇒
8
x
+
12
=
−
4
subtract 12 from both sides.
8
x
+
12
−
12
=
−
4
−
12
⇒
8
x
=
−
16
To solve for x, divide both sides by 8
8
x
8
=
−
16
8
⇒
x
=
−
2
As a check
Substitute this value into the equation and if the left side is equal to the right side for this value then it is the solution.
left side
=
(
5
×
−
2
)
+
12
=
−
10
+
12
=
2
right side
=
−
(
3
×
−
2
)
−
4
=
=
6
−
4
=
2
⇒
x
=
−
2
is the solution
Answer:
b Beacuse you can't times 3 by twelve but you can multiple 3times7+1 to get 19
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