Answer;
No of spaghetti he purchase [tex]y=100[/tex]
Explanation:
Given,
Price of iced tea is[tex]=\$ 2[/tex] per bottle
Price of spaghetti is [tex]=\$ 8[/tex] per serving
Let no iced tea is [tex]=x[/tex]
Let no of spaghetti =[tex]=y[/tex]
[tex]x+y=200[/tex] Â
multiply by 2
[tex]2x+2y=400[/tex] Â Â Â Â Â Â Â (i)
[tex]2x+8y=1000[/tex] Â Â Â Â Â Â Â (ii)
  (ii)-(i) Â
[tex]2x+8y-2x-2y=1000-400[/tex]
[tex]6y=600[/tex]
[tex]y=100[/tex]
[tex]x+y=200[/tex]
[tex]x=200-100[/tex]
[tex]x=100[/tex]
No of spaghetti is 100
No of iced tea is 100
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