1. **State the problem:** Solve the system of linear equations:
$$\frac{2x-7}{2} - \frac{2(x-y)}{3} = 0$$
$$\frac{x - y}{2} - \frac{7x - y}{6} = -2$$
2. **Rewrite each equation to clear denominators:**
Multiply the first equation by 6 (the least common multiple of 2 and 3):
$$6 \times \left(\frac{2x-7}{2} - \frac{2(x-y)}{3}\right) = 6 \times 0$$
$$3(2x-7) - 2 \times 2(x-y) = 0$$
$$3(2x-7) - 4(x-y) = 0$$
Multiply the second equation by 6 (LCM of 2 and 6):
$$6 \times \left(\frac{x - y}{2} - \frac{7x - y}{6}\right) = 6 \times (-2)$$
$$3(x - y) - (7x - y) = -12$$
3. **Simplify both equations:**
First equation:
$$3(2x-7) - 4(x-y) = 0$$
$$6x - 21 - 4x + 4y = 0$$
$$\cancel{6x} - 21 - \cancel{4x} + 4y = 0$$
$$2x + 4y - 21 = 0$$
Second equation:
$$3(x - y) - (7x - y) = -12$$
$$3x - 3y - 7x + y = -12$$
$$\cancel{3x} - 3y - \cancel{7x} + y = -12$$
$$-4x - 2y = -12$$
4. **Rewrite the system:**
$$2x + 4y = 21$$
$$-4x - 2y = -12$$
5. **Solve the system by elimination:**
Multiply the first equation by 1 and the second by 1 to align coefficients:
$$2x + 4y = 21$$
$$-4x - 2y = -12$$
Multiply the first equation by 2:
$$4x + 8y = 42$$
Add to the second equation:
$$(4x + 8y) + (-4x - 2y) = 42 + (-12)$$
$$\cancel{4x} + 8y - \cancel{4x} - 2y = 30$$
$$6y = 30$$
6. **Solve for $y$:**
$$y = \frac{30}{6} = 5$$
7. **Substitute $y=5$ into one of the original simplified equations:**
Using $$2x + 4y = 21$$:
$$2x + 4(5) = 21$$
$$2x + 20 = 21$$
$$2x = 21 - 20 = 1$$
$$x = \frac{1}{2}$$
**Final answer:**
$$x = \frac{1}{2}, \quad y = 5$$
Linear System 50908A
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