Help me please!can somebody give me the answer than try to explain how they got it

4x - 7y = 19

4(-4) - 7(-5) = 19

-16 - (-35) = 19

-16 + 35 = 19

19 = 19

(-4,-5) is a solution to given equation.

4(9) - 7(6) = 19

36 - 42 = 19

-6 ≠ 19

(9,6) is not a solution to given equation.

4(1) - 7(-3) = 19

4 - (-21) = 19

4 + 21 = 19

25 ≠ 19

(1, -3) is not a solution to given equation.

4(-6) - 7(2) = 19

-24 - 14 = 19

-38 ≠ 19

(-6,2) is not a solution to given equation.

Note:- A solution to an equation is any value which when substituted to a variable would make the equation true.

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

rauschg · hand

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step-by-step explanation:

solve systems of equations by graphing. a system of linear equations contains two or more equations e.g. y=0.5x+2 and y=x-2. the solution of such a system is the ordered pair that is a solution to both equations. to solve a system of linear equations graphically we graph both equations in the same coordinate system