6. which equation represents the equation that passes through the given points:
(1,5) & (3,-3)
a. y = 2x + 3
b. y = -4x +9
c. y = 2x – 9
d. y = - 4x +3

The answer is B

Find slope

                       y2 - y1

Formula:         x2 - x1

Just plug in values

Slope will be -4

Take equation and plug in a point

Equation:  y = mx + b

Plug in    5 = -4(1) + b

                5 = -4 + b

              +4   +4            

               9 = b

                 y = -4x + 9

use substitution to solve each system of equations. y = x + 5 3x + y = 25 62/87,21 y = x + 5 3x + y = 25 substitute x + 5 for y in the second equation. substitute the solution for x into either equation to find y. the solution is (5, 10)

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