The equations are

$\"\"$

Multiply the first equation by 2

Now the equation is

$\"\"$ Equation (1)

Multiply the second equation by negitive 5

Now the equation is

$\"\"$ Equation (2)

add the equations to eliminate variable x.

$\"\"$ (Write the equations in column form and add)

Substitute $\"\"$ in either equation to find the value of y.

$\"\"$ (Equation 1)

$\"\"$

The solution is $\"\"$ .

$\"\"$

Multiply the third equation by 4.

Now the equation is

$\"\"$ Equation (3)

Multiply the fourth equation by negitive 10.

$\"\"$ Equation (2)

add the equations to eliminate variable y.

$\"\"$ (Write the equations in column form and add)

$\"\"$

Substitute $\"\"$ in either equation to find the value of y.

$\"\"$ (Equation 3)

$\"\"$

The solution is $\"\"$ .