Paul is solving for x. He shows his work as follows: Step 1: 3x + 2 = 7x - 2
Step 2: 2 = 4x - 2
Step 3: 4 = 4x
Step 4: X = 1
When Paul checks his answer, he thinks he’s made a mistake At which step did Paul make a mistake?

This is correct

Step-by-step explanation:

Paul has made no mistakes but he probably is wondering if the 4x that he got in the equation is correct.  He might second guess that he shouldn't have subtracted the 3x from the 7x but instead divided the two numbers.

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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jeff jeff

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