What mistake did Brianna make? On Line 1, Brianna should have subtracted 3 instead of adding -3. On Line 1, Brianna violated the
2 answers:
Question:
Brianna solved a two-step equation, but she made a mistake along the way.
Line 1
:
Line 2
:
Line 3
:
Line 4:
Answer:
On Line 3, Brianna should have divided by 0.1 instead of subtracting 0.1.
Step-by-step explanation:
Required
Where did she make a mistake?
To do this, we simply analyse her workings one step at a time
Equation:
Line 1
:
This is correct because she subtracted 0.3 from both sides
Line 2
:
This is also correct because she performed the arithmetic correctly
Line 3
:
This is incorrect.
Division by 0.1 is expected not subtraction
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Answer:
$8.85
Step-by-step explanation:
This a question of direct variation, so we can make out a relationship between the two factors. 12 is 2/3 of 18, so the cost of 12 would also be 2/3 of the cost of 18. We can now make an equation to solve.