YanaSidlinskiy
  • YanaSidlinskiy
Answers that need to be checked! 1.) Determine whether each ordered pair is a solution of the system of linear equations. 3y=9x+12 3x-y=-4 a. (-2,-2) b. (0,4) MY ANSWER: I PUT YES
Mathematics
jamiebookeater
  • jamiebookeater
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YanaSidlinskiy
  • YanaSidlinskiy
2.) Solve the system of equations by graphing. x-y=4 y=-1 MY ANSWER: (1,-3) (0,-4)
YanaSidlinskiy
  • YanaSidlinskiy
Lines intersect @ (1, -3)
Nnesha
  • Nnesha
yep that's right but why did you put 0 , -4 for 2nd question ?

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YanaSidlinskiy
  • YanaSidlinskiy
3.) Solve the system of equations by graphing. y=-4x+2 3y+12x=6 Lines intersect @ (1, -2)
YanaSidlinskiy
  • YanaSidlinskiy
I have to find 2 points to plot it on the graph.
YanaSidlinskiy
  • YanaSidlinskiy
Solve the system of equations by substitution. x=7y+6 -2x+14y=-12 I got infinitely many solutions.
Nnesha
  • Nnesha
last one when you solve 2nd equation for y you will get 1st equation so i would write infinitely many solution
Lurker
  • Lurker
1)b 2) wrong 3)right 4)right
Nnesha
  • Nnesha
i mean 3rd question
YanaSidlinskiy
  • YanaSidlinskiy
I'm confused....
YanaSidlinskiy
  • YanaSidlinskiy
What do you mean?
YanaSidlinskiy
  • YanaSidlinskiy
Are you saying I solved for number 3 wrong then?
Nnesha
  • Nnesha
what's the statement for 3rd question ? they are asking 4 solution ?
YanaSidlinskiy
  • YanaSidlinskiy
For number 3, they are asking my to solve by graphing. Y HAS ALREADY been solved for.. Now I need to solve for the other equation. When solving for the other equation and plotting it on the graph, lines intersect at points (1, -2). Is the intersection point correct?
Nnesha
  • Nnesha
\(\color{blue}{\text{Originally Posted by}}\) @YanaSidlinskiy 3.) Solve the system of equations by graphing. y=-4x+2 3y+12x=6 Lines intersect @ (1, -2) \(\color{blue}{\text{End of Quote}}\) for this one you will get same line both equations are same so thats mean they are intersecting at every point
Nnesha
  • Nnesha
solve 2nd equation for y \[\huge\rm 3y+12x=6\] subtract 12x both sides and then divide by 3
Nnesha
  • Nnesha
its called dependent system when 2 equations represent the same line (same slope ,same y-intercept )
YanaSidlinskiy
  • YanaSidlinskiy
This topic is on solving by the graphing method....
Nnesha
  • Nnesha
okay so when you graph both equation you will get same line there isn't ONE point where they intersect so answer would be infinitely many solution
Nnesha
  • Nnesha
1) right 2nd) you just need a point where both lines intersect ,not the y-intercept 4th) right
Nnesha
  • Nnesha
let me know if u r still confused :=)
YanaSidlinskiy
  • YanaSidlinskiy
Thanks! Glad you could help out a little!

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