1) y = 6x − 11 −2x − 3y = −7 4) −3x − 3y = 3 y = −5x − 17 7)−4x + y = 6 −5x − y = 21 8) −7x − 2y = −13 x − 2y = 11 18) −2x + 6y = 6 −7x + 8y = −5 My teacher started a new unit and i wasn't hear to get the teaching so i chose some random problems and hopefully one of them is easy enough for you to teach me how to do it

See Explanation

Step-by-step explanation:

1.

Given

Solve for x and y

In the first equation, we have:

Substitute for in the second

Divide through by -1

Recall that:

2,

Given

In the second equation, we have:

Substitute for in the first equation

Recall that:

3. Given

Add both equations to eliminate y

Solve for x

Substitute -3 for x in the first equation:

4. Given

Make x the subject in the second equation

Substitute 11 + 2y for x in the first equation

Substitute -4 for y in

5. Given

Multiply the first equation by 7 and the second by - 2 to eliminate x

The first

The second

Add the resulting equations

------------------------------

Solve for y

Substitute 2 for y in

Solve for x

u = -(6/7)w

step-by-step explanation:

place all values with 'u' on one side of the equation.

4u + 8w = - 3u + 2w

4u + 3u = 2w - 8w

further simplify the equation by solving the addition and subtraction.

7u = - 6w

make 'u' the independent variable by placing its co-efficient on the right-hand side.

u = - (6/7)w