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8.
[tex]\[
\begin{array}{l}
\text{(a)} \frac{u + 1}{6} - \frac{v - u}{2} = 6 \\
\frac{2u - 4}{3} + \frac{\underline{v} - u}{2} = 2
\end{array}
\][/tex]
(b)


Sagot :

Certainly! Let's delve into solving the system of equations step by step.

We have two equations:
[tex]$ \begin{aligned} &\left( \frac{u + 1}{6} - \frac{v - u}{2} = 6 \right) \quad \text{(1)} \\ &\left( \frac{2u - 4}{3} + \frac{v - u}{2} = 2 \right) \quad \text{(2)} \end{aligned} $[/tex]

We need to solve this system of equations to find the values of [tex]\( u \)[/tex] and [tex]\( v \)[/tex].

### Step 1: Simplify Equation (1)

Starting with Equation (1):
[tex]$ \frac{u + 1}{6} - \frac{v - u}{2} = 6 $[/tex]

Multiply through by [tex]\( 6 \)[/tex] to clear the denominator:
[tex]$ (u + 1) - 3(v - u) = 36 $[/tex]
[tex]$ (u + 1) - 3v + 3u = 36 $[/tex]
Combine like terms:
[tex]$ 4u - 3v + 1 = 36 $[/tex]
Move constants to the other side:
[tex]$ 4u - 3v = 35 \quad \text{(3)} $[/tex]

### Step 2: Simplify Equation (2)

Now let's simplify Equation (2):
[tex]$ \frac{2u - 4}{3} + \frac{v - u}{2} = 2 $[/tex]

Multiply through by [tex]\( 6 \)[/tex] (the least common multiple of the denominators) to clear the fractions:
[tex]$ 2(2u - 4) + 3(v - u) = 12 $[/tex]
Distribute:
[tex]$ 4u - 8 + 3v - 3u = 12 $[/tex]
Combine like terms:
[tex]$ u + 3v - 8 = 12 $[/tex]
Move constants to the other side:
[tex]$ u + 3v = 20 \quad \text{(4)} $[/tex]

### Step 3: Solve the System of Equations

We now have two linear equations:
[tex]$ \begin{aligned} &4u - 3v = 35 \quad \text{(3)} \\ &u + 3v = 20 \quad \text{(4)} \end{aligned} $[/tex]

### Add Equations (3) and (4)

By adding Equation (3) and Equation (4), we eliminate [tex]\( v \)[/tex]:
[tex]$ (4u - 3v) + (u + 3v) = 35 + 20 $[/tex]
[tex]$ 5u = 55 $[/tex]
Divide both sides by 5:
[tex]$ u = 11 $[/tex]

### Substitute [tex]\( u \)[/tex] back into Equation (4)

We substitute [tex]\( u = 11 \)[/tex] back into Equation (4) to find [tex]\( v \)[/tex]:
[tex]$ 11 + 3v = 20 $[/tex]
Subtract 11 from both sides:
[tex]$ 3v = 9 $[/tex]
Divide both sides by 3:
[tex]$ v = 3 $[/tex]

### Summary

The solution to the system of equations is:
[tex]$ u = 11 \quad \text{and} \quad v = 3 $[/tex]