anonymous
  • anonymous
Use elimination to solve the system of equations. Find ordered pairs. { 5x-3y=42 8x+5y=28
Mathematics
katieb
  • katieb
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Mertsj
  • Mertsj
Multiply the top equation by 5 Multiply the second equation by 3 Add the two equations.
Mertsj
  • Mertsj
25x-15y=210 24x+15y= 84 49x = 294 Now divide both sides by 49
Mertsj
  • Mertsj
What does x = ?

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anonymous
  • anonymous
x=6 right?
Mertsj
  • Mertsj
yes. Now find y
anonymous
  • anonymous
how do i find y?
Mertsj
  • Mertsj
Replace x with 6 in any equation that has both an x and a y and solve that equation for y
anonymous
  • anonymous
so like 5x-3(6)=42?
Mertsj
  • Mertsj
I believe you said that x = 6. So why did you replace y with 6 if it is x that is equal to 6?
anonymous
  • anonymous
oh! so it would be 5(6)-3=42 i don't understand how to do these problems with elimination, I only know how to do them as substitution.
Mertsj
  • Mertsj
What happened to the y?
Mertsj
  • Mertsj
|dw:1327614823096:dw|
Mertsj
  • Mertsj
Put the 6 where the x was and solve.
anonymous
  • anonymous
so 30-3y=42 and i miss the 30 from 42 right?
anonymous
  • anonymous
minus*
Mertsj
  • Mertsj
Subtract 30 from both sides.
anonymous
  • anonymous
y=4 right?
Mertsj
  • Mertsj
|dw:1327615016204:dw|
Mertsj
  • Mertsj
Divide both sides by -3
anonymous
  • anonymous
y=-4
Mertsj
  • Mertsj
Yes
Mertsj
  • Mertsj
|dw:1327615140320:dw|
anonymous
  • anonymous
thank you so much, means alot ^.^ <3
Mertsj
  • Mertsj
yw

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