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11-10-2016
Mathematics

contestada

What is the elimination of 20x+5y=120 and 10x+7.5=80

Respuesta :

11-10-2016

20x+5y=120
10x+7.5y=80 multiply this one by 2
___________

20x+5y=120
20x+15y=160 subtract

___________

-10y=-40 divide both sides by -10
____________

y=4

20x+5(4)=120 plug 4 in for y in the first equation
20x+20=120 multiply
20x=100 subtract
x=5 divide to find x

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