Question

Solve the system by graphing? Help?!
-3x-y= -10
4x-4y=8

Answer 1

Well, graph them. Slope-Intercept Form is often convenient. Find their intersection.

Answer 2

Is there a formula? @tkhunny

Answer 3

y=mx+b is the formula

Answer 4

how would i plug it in?

Answer 5

rearrange -3x-y=-10 and 4x-4y=8 so that they are in slope intercept form: y=mx+b.
do you know how to do it?

Answer 6

No :/

Answer 7

4y=m(4x)+8?

Answer 8

\[-3x-y=-10\]
\[-y=3x-10\]
\[y=-3x+10\]

Answer 9

how about now?

Answer 10

you do the same thing with; 4x - 4y = 8
-4y = -4x - 8 ; subtract 4x from both sides
y= x -2 ; divide -4 from both sides

now you are left in slope intercept form y = x - 2

Answer 11

are you able to graph the two?
y=-3x+10
y=x-2

Answer 12

hold on im graphing

Answer 13

(3,-1)?

Answer 14

are those the points you got from graphing?

Answer 15

i dont get it

Answer 16

Can you solve the two equations for y or not?

Answer 17

no

Answer 18

What is your plan for graphing them? I have to believe that you are given a "solve by graphing" problem only AFTER you have been given sufficient information to graph the equations.

Answer 19

Take the first equation and add 3x to both sides.
What do you get?

Answer 20

Y=-3x+10 all u have to do is make a table. Have x on the top of a sideways ladder tas and y on the bottom. Make 3 sections. Have -1 as x on the first section and the 0 then 1 the for y you just have to plug it in the equation and then graph it. Do the same for the other equation

Answer 21

(-1,3) or (3,1)?

Answer 22

Like for -1 u do -3(-1) which is 3 and thenu add10 which is 13 so your first point is (-1, 13) then do the same for the rest do u get it?

Answer 23

?

Answer 24

@otonoGold u have to have three x points because it doesn't give a specific coordinate so you have to pick the x coordinate except it has to be one negative number one zero then a positive of that same number like I chose -1, 0 and 1

Answer 25

(3,-1) is incorrect

Answer 26

So I see we are guessing now.

Answer 27

Ok so I got 3 coordinates by doing what I told you to do last comment. I have (-1,13) (0,10) and (1,7) for the equation -3x-y=10

Answer 28

The next equation is 4x-4y=8 like the other guy showed u we have to simplify that. So we get y= x-2 do the same table formula again an ill post my answers in a sec

Answer 29

I got (-1,-3) (0,-2) and (1,-1) I would show u a pic but I don't know how to

Answer 30

Hope I helped

Answer 31

Then u just graph the points in a graph, but make two different graphs for the two different equations.

Answer 32

Put both equations on one graph. The point where the lines cross is the solution of the system.

Answer 33

Ops yeah but them in the same graph I messed up! Sorry! :( @otonogold

Answer 34

Did it work?