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Setler
[38]
3 years ago
8
What is the elimination of 20x+5y=120 and 10x+7.5=80
Mathematics
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1
answer:
Grace
[21]
3 years ago
5
0
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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