berkeleystir berkeleystir

01-04-2019
Mathematics

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solve the system of equations using elimination/ combinations.
-2x - y= -4
x+ 2y = 5

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LammettHash LammettHash

01-04-2019

If [tex]-2x-y=-4[/tex] and [tex]x+2y=5[/tex], notice that

[tex](-2x-y)+2(x+2y)=-4+2\cdot5\implies3y=6\implies y=2[/tex]

Then

[tex]x+2\cdot2=5\implies x=1[/tex]

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