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Solve the system of equations:

[tex]\[
\begin{cases}
2x - y = 6 \\
4x + 2y = 3
\end{cases}
\][/tex]


Sagot :

Certainly! Let's solve the given system of equations step-by-step.

The system of equations is:
[tex]\[ \left\{\begin{array}{ll} (1) & 2x - y = 6 \\ (2) & 4x + 2y = 3 \end{array}\right. \][/tex]

### Step 1: Express one of the variables in terms of the other from one of the equations.

Let's take the first equation and solve for [tex]\( y \)[/tex]:

[tex]\[ 2x - y = 6 \implies y = 2x - 6 \][/tex]

### Step 2: Substitute this expression into the other equation.

Now, substitute [tex]\( y = 2x - 6 \)[/tex] into the second equation:

[tex]\[ 4x + 2(2x - 6) = 3 \][/tex]

### Step 3: Solve the resulting equation for [tex]\( x \)[/tex].

Expand and simplify the equation:

[tex]\[ 4x + 4x - 12 = 3 \\ 8x - 12 = 3 \\ 8x = 3 + 12 \\ 8x = 15 \\ x = \frac{15}{8} \][/tex]

### Step 4: Substitute the value of [tex]\( x \)[/tex] back into the equation from step 1 to find [tex]\( y \)[/tex].

Substitute [tex]\( x = \frac{15}{8} \)[/tex] into [tex]\( y = 2x - 6 \)[/tex]:

[tex]\[ y = 2\left(\frac{15}{8}\right) - 6 \\ y = \frac{30}{8} - 6 \\ y = \frac{30}{8} - \frac{48}{8} \\ y = \frac{30 - 48}{8} \\ y = \frac{-18}{8} \\ y = -\frac{9}{4} \][/tex]

### Conclusion

The solution to the system of equations is:

[tex]\[ \left( x, y \right) = \left( \frac{15}{8}, -\frac{9}{4} \right) \][/tex]

So the values of [tex]\( x \)[/tex] and [tex]\( y \)[/tex] are [tex]\( \frac{15}{8} \)[/tex] and [tex]\( -\frac{9}{4} \)[/tex] respectively.