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- 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

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- YanaSidlinskiy

2.) Solve the system of equations by graphing.
x-y=4
y=-1
MY ANSWER: (1,-3) (0,-4)

- YanaSidlinskiy

Lines intersect @ (1, -3)

- Nnesha

yep that's right but why did you put 0 , -4 for 2nd question ?

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- YanaSidlinskiy

3.) Solve the system of equations by graphing.
y=-4x+2
3y+12x=6
Lines intersect @ (1, -2)

- YanaSidlinskiy

I have to find 2 points to plot it on the graph.

- YanaSidlinskiy

Solve the system of equations by substitution.
x=7y+6
-2x+14y=-12
I got infinitely many solutions.

- Nnesha

last one when you solve 2nd equation for y you will get 1st equation
so i would write infinitely many solution

- Lurker

1)b
2) wrong
3)right
4)right

- Nnesha

i mean 3rd question

- YanaSidlinskiy

I'm confused....

- YanaSidlinskiy

What do you mean?

- YanaSidlinskiy

Are you saying I solved for number 3 wrong then?

- Nnesha

what's the statement for 3rd question ? they are asking 4 solution ?

- 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

\(\color{blue}{\text{Originally Posted by}}\) @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

solve 2nd equation for y \[\huge\rm 3y+12x=6\]
subtract 12x both sides and then divide by 3

- Nnesha

its called dependent system when 2 equations represent the same line (same slope ,same y-intercept )

- YanaSidlinskiy

This topic is on solving by the graphing method....

- 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

1) right
2nd) you just need a point where both lines intersect ,not the y-intercept
4th) right

- Nnesha

let me know if u r still confused :=)

- YanaSidlinskiy

Thanks! Glad you could help out a little!

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