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Let's solve the given equations one by one and check whether \( x = 135 \) satisfies them.

### Equation 1: 
\[ 7x - 230 = 715 \]

Substitute \( x = 135 \):

\[
7(135) - 230 = 715
\]
\[
945 - 230 = 715
\]
\[
715 = 715 \quad \text{(True)}
\]

So, Equation 1 is correct.

---

### Equation 2: 
\[ 5x + 34 = 675 \]

Substitute \( x = 135 \):

\[
5(135) + 34 = 675
\]
\[
675 + 34 = 675
\]
\[
709 \neq 675 \quad \text{(False)}
\]

So, Equation 2 is incorrect.

---

### Equation 3: 
\[ 3x - 84 = 321 \]

Substitute \( x = 135 \):

\[
3(135) - 84 = 321
\]
\[
405 - 84 = 321
\]
\[
321 = 321 \quad \text{(True)}
\]

So, Equation 3 is correct.

---

### Equation 4: 
\[ \frac{x}{9} \times 14 = 19 \]

Substitute \( x = 135 \):

\[
\frac{135}{9} \times 14 = 19
\]
\[
15 \times 14 = 19
\]
\[
210 \neq 19 \quad \text{(False)}
\]

So, Equation 4 is incorrect.

---

### Equation 5: 
\[ 3x + 63 = 203 \]

Substitute \( x = 135 \):

\[
3(135) + 63 = 203
\]
\[
405 + 63 = 203
\]
\[
468 \neq 203 \quad \text{(False)}
\]

So, Equation 5 is incorrect.

---

### Final Answer:
The correct equations where \( x = 135 \) are:
- Equation 1: \( 7x - 230 = 715 \)
- Equation 3: \( 3x - 84 = 321 \)

Let me know if you want more details on these solutions or have other questions! Here are 5 questions to explore further:

1. How do we solve for \( x \) when it isn't provided?
2. What are the steps to isolate \( x \) in an equation?
3. How do you verify if a given value is a solution to an equation?
4. What happens if the equations are inequalities instead?
5. How can systems of equations be solved when there are multiple variables?

**Tip:** Always double-check your arithmetic when substituting values into equations!

Find which equations below are true when x = 135:
1. 7x - 230 = 715
2. 5x + 34 = 675
3. 3x - 84 = 321
4. (x/9) * 14 = 19
5. 3x + 63 = 203

Learn how to determine which equations hold true when x = 135. This algebra problem focuses on checking solutions by substituting x into linear equations and verifying their validity. Great practice for students in Grades 6-8.

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