Chapter 3: Problem 40
Solve each equation. $$5(3 y-2)=16 y$$
Short Answer
Expert verified
The solution is \( y = -10 \).
Step by step solution
01
Distribute the 5
Start by distributing the 5 across the terms inside the parentheses. This gives us the equation: \[ 5 imes 3y - 5 imes 2 = 16y \] Simplifying this, we have: \[ 15y - 10 = 16y \]
02
Isolate the variable term
Next, we need to get terms involving \( y \) on one side of the equation. Subtract \( 15y \) from both sides to move the \( y \)-term to one side: \[ 15y - 10 - 15y = 16y - 15y \] This simplifies to: \[ -10 = y \]
03
Verification
Substitute \( y = -10 \) back into the original equation to verify the solution: \[ 5(3(-10) - 2) = 16(-10) \] Simplify the left side: \[ 5(-30 - 2) = 5(-32) = -160 \] Simplify the right side: \[ 16(-10) = -160 \] Both sides are equal, confirming that \( y = -10 \) is correct.
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Distributive Property
The distributive property is a powerful tool in algebra that helps us simplify expressions and solve equations efficiently. It's used when you have a number outside a set of parentheses that needs to be distributed across the terms inside the parentheses. For the equation \( 5(3y - 2) = 16y \), you need to apply the distributive property by multiplying \(5\) with each term inside the parentheses.
Here’s how you do it:
Here’s how you do it:
- Multiply \(5 \times 3y\) to get \(15y\).
- Multiply \(5 \times (-2)\) to get \(-10\).
Isolating Variables
Isolating the variable is the crucial step in solving equations. The goal is to get the variable, in this case, \( y \), on one side of the equation so you can easily see what it equals. From our equation \( 15y - 10 = 16y \), we want to move all terms involving \( y \) to one side.Start by eliminating \( 15y \) from the left side of the equation. We do this by subtracting \( 15y \) from both sides. Here's what it looks like:
- Subtracting \( 15y \) from \( 15y - 10 \) gives you \(-10\).
- Subtracting \( 15y \) from \( 16y \) leaves you with \( y \).
Verification of Solutions
Verification is a critical step to ensure that the solution you've found is indeed correct. After isolating the variable and determining that \( y = -10 \), we substitute it back into the original equation to check our work.The original equation is \( 5(3y - 2) = 16y \). Substitute \( y = -10 \) into the equation:
- The left side becomes \( 5(3(-10) - 2) = 5(-32) \), which simplifies to \(-160\).
- The right side is \( 16(-10) \), which also simplifies to \(-160\).