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To solve this problem, we'll begin with the system of equations:
We will use the elimination method to solve for and . First, let's align the equations to eliminate .
We notice that if we multiply Equation 2 by 2, it becomes easier to align coefficients with Equation 1:
Simplifying gives:
Now, we have:
To eliminate , let's add the equations after aligning coefficients. Multiply Equation 1 by 5 and Equation 3 by 1 to eliminate :
Which gives:
Adding these:
Solving for , we divide by 32:
Substitute back into Equation 2:
Subtract 4 on both sides:
Dividing by 5 gives:
Thus, we have determined the solution to the system of equations:
.
\( \begin{cases} x+y=8 \\ x-y=6 \end{cases} \)
We need the y-coefficients to be opposites so they cancel out! Equation 1 has -2y, and equation 3 has +10y. Multiplying by 5 gives us -10y and +10y, which add to zero.
Absolutely! You could solve for x, getting , then substitute into the first equation. Both methods work!
That's normal! The goal is to make one variable's coefficients opposite numbers (like +10y and -10y) so they cancel when you add the equations together.
Look for the variable that's easier to eliminate! In this problem, y has coefficients -2 and +5, which are simpler to work with than the x coefficients 6 and 1.
Let's check! First equation:
Second equation:
Both sides match!
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