SOLUTION: Please help with these difficult homework problems: 1. Find the intersection point of the two straight lines: 3x - 4y = 5 and 2x + 3y =1. Answer in lowest terms. 2. In the x-

Question 458297: Please help with these difficult homework problems:
1. Find the intersection point of the two straight lines: 3x - 4y = 5 and 2x + 3y =1. Answer in lowest terms.
2. In the x-y coordinate system, the equation y = 5 represents
(A) A point on the x-axis.
(B) A point on the y-axis.
(C) A vertical line.
(D) A horizontal line.
5. (2 points) Use the Gauss-Jordan elimination method to solve the system. Enter answer in the form
(x,y,z). DO NOT use any other method. On the test you will be asked to show all steps.
{x + 2y - 3z = -5
{x + 4y - 7z = -13
{x - y + 2z= 1

Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
I will just do #2.

~ , after doing -R1 + R2 and -R1 + R3
~, after doing -R2 + R3
~, after 3R3.
~after 2R3 + R2
~, after 3R3 + R1 and -2R2 + R1
Hence x = -3, y = 8, and z = 6.
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