Question

3) Solve : x + y = 13 ; x - y = 17​

Answer 1

Answer:

x=15

y=-2

Step-by-step explanation:

It can be solved by elimination method

x+y=13

x-y=17

2x=30

x=15

so y=-2

Answer 2

Answer:

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

Step-by-step explanation:

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

// plug this in for variable x in equation

(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 the x

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