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solve these simultaneous equations using elimination 5x y=18 x y=6

Sagot :

Answer:

Step-by-step explanation:

To solve the simultaneous equations using the elimination method, we start with the given equations:

1. \( 5x - y = 18 \)

2. \( x + y = 6 \)

First, we'll eliminate one of the variables by adding or subtracting the equations. Let's eliminate \( y \) by adding the two equations together.

Adding equation (1) and equation (2):

\[ (5x - y) + (x + y) = 18 + 6 \]

Simplify the left side:

\[ 6x = 24 \]

Now, solve for \( x \):

\[ x = \frac{24}{6} \]

\[ x = 4 \]

Now that we have \( x = 4 \), substitute this value back into equation (2) to find \( y \):

\[ 4 + y = 6 \]

Subtract 4 from both sides:

\[ y = 6 - 4 \]

\[ y = 2 \]

So, the solutions to the simultaneous equations are \( x = 4 \) and \( y = 2 \).

To verify:

Substitute \( x = 4 \) and \( y = 2 \) back into equation (1):

\[ 5(4) - 2 = 20 - 2 = 18 \]

Equation (1) holds true.

Substitute \( x = 4 \) and \( y = 2 \) back into equation (2):

\[ 4 + 2 = 6 \]

Equation (2) also holds true.

Therefore, the solution to the simultaneous equations using the elimination method is \( \boxed{(4, 2)} \).