Chapter 1 - Systems of Linear Equations - 1.1 Introduction to Systems of Linear Equations - 1.1 Exercises - Page 10: 16

$x=-2$ $y=5$ (-2, 5)

$-x + 3y = 17$ $4x + 3y = 7$ Subtract the second equation from the first one. $-x + 3y - (4x + 3y) = 17 - 7$ $-x -4x +3y -3y = 10$ $-5x = 10$ $x = -2$ Substitute x in the first equation to get y $-(-2)+3y=17$ $2+3y=17$ $3y=15$ $y=5$