anonymous
  • anonymous
Solve 2x + 5y = –13 3x – 4y = –8 a. (4, 1) b. (–4, 1) c.(4, –1) d.(–4, –1)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
do you want the answer or how to solve it ? :P
inkyvoyd
  • inkyvoyd
There's an easy way and a hard way to do this problem.
inkyvoyd
  • inkyvoyd
The first way is to substitute like an idiot. Works, but can be slower. (if one ordered pair matches both equations then that is your answer)

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More answers

anonymous
  • anonymous
no answe i want to learn how to solve my self please
inkyvoyd
  • inkyvoyd
Second way is to multiply equation one by 3, and equation two by 2, and subtract the equations.
anonymous
  • anonymous
@inkyvoyd why do you call idiots the one who substitute?? don't be rude dude!
.Sam.
  • .Sam.
2x + 5y = –13 3x – 4y = –8 From (1) 2x + 5y = –13 x = (–13-5y)/2 --------------------- 3x – 4y = –8 3 (–13-5y)/2 – 4y = –8 (3(-5y-13))/(2)-4y=-8 (3(-5y-13))/(2)-4y*(2)/(2)=-8 (3(-5y-13))/(2)-(8y)/(2)=-8 (3(-5y-13)-(8y))/(2)=-8 (-23y-39)/(2)=-8 -23y-39=-16 -23y=23 y=-1 --------------------------------- x = (–13-5y)/2 x = (–13-5(-1))/2 x=(-13+5)/(2) x=(-8)/(2) x=-4 (-4,-1)
inkyvoyd
  • inkyvoyd
Well, sam wins.
anonymous
  • anonymous
I still want to learn how to solve onn my own no answers
inkyvoyd
  • inkyvoyd
And, idiots are ones who subsitute because if the coefficients of the equation are very nasty, they will have much trouble solving. Any big numbers, or string of radicals will make it very hard to try reverse substitution to solve.
inkyvoyd
  • inkyvoyd
The ones where substitution are fast I can usually solve in my head with trial and error.
inkyvoyd
  • inkyvoyd
btw, there's a third way, called actual "subsitution"
inkyvoyd
  • inkyvoyd
But sam posted that too, nvm
anonymous
  • anonymous
could you explain like the first step into solve because i always have a hard time with this type of problems

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