Share
Explore BrainMass

# I need to know how to do the problems.

#### Solution Preview

Hi,

Please find the solution/explanation attached herewith.

Thanks,
Sandhya Sharma
106036

I have attached PDF file. (As word file was more than 2 MB)

Solution 1:

Graph both the lines on same grid as shown below:

We can see that lines are parallel.
Thus, there is NO solution.

Solution2:
Graph both the lines on same grid as shown below:

Both the lines intersect at (2, -3).

The solution is x = 2, y = -3.

Solution3:

The graph of both the lines is same.

Thus, there will be infinitely many solutions.

Solution4: (a)

Solution5: (a)

Solution6: (D)

Solution7: (C)

Solution8:

5x + 7y = 12------------(i)
x - 4y = -3------------(ii)

Multiply equation (ii) by -5

-5x + 20y = 15

27y = 27 => y = 1

Now, x - 4y = -3
x - 4 = -3
=> x = 1

The solution is x = 1, y = 1

Solution9:

Substitute value of y in 4x - 4y = 0

4x - 4(2x - 5) = 0
4x - 8x + 20 = 0
-4x + 20 = 0
=> -4x = -20
=> x = 5

Now, y = 2x - 5 = 2(5) - 5 = 10 - ...

\$2.19