1. which description best describes the solution to the following system of equations?

y = –x + 4
y = 3x + 3 (4 points)

line y = –x + 4 intersects the line y = 3x + 3.
lines y = –x + 4 and y = 3x + 3 intersect the x-axis.
lines y = –x + 4 and y = 3x + 3 intersect the y-axis.
line y = –x + 4 intersects the origin.

2.
a pair of equations is shown below.

x + y = 5
y = 1/2(one half) x + 2

if the two equations are graphed, at what point do the lines representing the two equations intersect? (4 points)

(2, 5)
(5, 2)
(2, 3)
(3, 2)

3. attachment 1

answer: a video game has three difficulty levels: easy, medium, and expert. the game's scoring works in such a way that a player has to score a fixed number of points to advance to the next level, and then the scoring starts over. the total score needed to clear all three difficulty levels is 7,500. two times the number of points needed to clear the easy level is 500 more than the number of points needed to clear the medium level. twice the number of points needed to clear the medium difficulty level is 1,500 more than the number of points needed to clear the expert level. if x, y, and z represent the easy, medium, and expert levels, respectively, and a is the coefficient matrix of the system of equations modeling this situation, identify the inverse matrix, a-1, and the solution matrix, x, of the system of equations.

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rauschg

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