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y = -4x +1

Step-by-step explanation:

The slope-intercept form of a straight line is

y = mx +b

The formula for the slope (m) is

m = (y₂ - y₁)/(x₂ - x₁)

The two points on the line are

(-1, 5) and (1, -3)

m = (-3 – 5)/[1 – (-1)]      Substitute the values

m = -8/(1+1)

m = -8/2

m = -4

Substitute the value of m into the general formula.

y = -4x  + b

At (-1, 5)

5 = -4(-1) + b     Remove parentheses

5 = 4 + b          Subtract 4 from each side

b = 1

The equation of the straight line is y = -4x +1.

a. she will receive a refund of $278.

step-by-step explanation:

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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