Question

Solve : x + y = 13 ; x – y = 17​

Answer 1

Answer:

{x,y} = { 15,-2}

Step-by-step explanation:

// solve equation (2) x= y + 17

// plug this in for variable x in equation (1)

(1) ( y+17) + y = 13

(1) 2 y = -4

// By now we know this much:

x= y+7

y= -2

// use the y value to solve for x

x= (-2) +17 = 15

{ x,y} = {15,-12}