crisfusecrawalla crisfusecrawalla

02-03-2017
Mathematics

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X - Y = 11
2x + Y = 19

where do the lines cross

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wolf1728 wolf1728

02-03-2017

Just solve the equations:
A) X - Y = 11
B) 2x + Y = 19
Multiply A) by -2

A) -2X +2Y = -22 then add to B)
B) 2x + Y = 19
3Y = -3
Y=-1

A) X - -1 = 11
x = 10

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