brandoduh
Solve using substitution
2x=y+9
5y=10x-45
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lgbasallote
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if 2x = y + 9
then let y = 2x - 9
make sense?
brandoduh
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no really :/
gypsi
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find one variable, either x or y, first
brandoduh
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i think ill choose x
gypsi
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so if you get x alone for one equation, you then replace what you get into the second equation and solve for y
brandoduh
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so i mutiply 10x on all 3 of the first equation?
gypsi
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o.O? to get x alone? or?
brandoduh
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to subtract it with the other equation?
gypsi
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are you trying to solve it by elimination?
brandoduh
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no by substitution
gypsi
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if you get Y alone in the first equation it would be what the first person said y=2x-9 then you substitute the 2x-9 into the second equation getting
5(2x-9)=10x+45
gypsi
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10x-45=10x-45*
brandoduh
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oh i kinda get it. then you multipy 5 on the parantesis
brandoduh
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than you add like terms?
gypsi
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both sides equal each other if you combine like terms you get 0=0
brandoduh
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:o o? wow. now i have to solve the other 1
gypsi
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good luck! hope it helped.
brandoduh
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its sure did friend=)