Question

solve the system by using a table.

-0.2x-0.3y=0.2
0.4x-0.3y=1.4

answers:
(2,2)
(2,-2)
(2,1)
(-2,2)

Answer 1

Can u explain what u mean by table

Answer 2

you have to use a graphing calculator to solve

Answer 3

U can try this method i forget what it is called

Setting X or Ys to equal the same digit.

For X

Multiplying first equation by 2 so you have

-0.4x-0.6y=0.4

now add down so its looks like this
\[-0.4x-0.6y=0.4 \]
\[+\]
\[-0.4x-0.3y=1.4 \]

So equation is

\[-0.9y=1.8\]

Now solve for y

\[y=-2\]

Now plug back in either equation

\[-0.4x-0.6*(-2)=0.4 \]

= \[-0.4x+1.2=0.4 \]

Now solve for x by first subtracting 1.2 then dividing by 0.4

\[-0.4x=0.4-1.2\]

\[\frac{ -0.4x }{ 0.4 } x=\frac{ -0.8 }{ -0.4 }\]

\[x=2\]

Therefore , we conclude it to be

\[(2,-2)\]

Answer 4

thank you so much!!