Question

{x+y=13
{2x-y= -1

{x+y= 8
{-x+= -2

{x+y=-2
{2x-y=-10

Answer 1

Ola Lfe

a)

x + y = 13
2x - y = -1

3x = 12
x = 12/3 = 4

4 + y = 13
y = 13 - 4 = 9 

b)

x + y = 8
-x = -2

x = 2

2 + y = 8
y = 8 - 2 = 6

c)

  x + y = -2
2x - y  = -10

3x = -12
x = -12/3 = -4

-4 + y = -2
y = 4 - 2 = 2

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