#1**+5 **

Solve the system by using a table

{-0.6x-0.6y=-0.6

{0.5x-0.3y=2.7

A. (4,-3)

B. (-3,4)

C. (-4,-3)

D. (-3,-4)

======================================================================================

I'm not sure how to solve "using a table" [ maybe someone else knows ???]

If we mutiply both equations by 10 to clear the decimals, we have

5x - 3y = 27 .....and.....

-6x - 6y = -6 divide through by -6 and we have x + y = 1 which implies that, y = 1 - x

Substituting this into the first equation, we have

5x - 3(1 - x) = 27 simplify

5x - 3 + 3x = 27

8x -3 = 27

8x = 30

x = 30/8 = 15/4 = 3.75 and y = 1 - 15/4 = -11/4 = -2.75

Mmmmmm...it doesn't look like * any* of these answers work!!! [I checked this with WolframAlpha....my solutions are correct !!! ]

CPhill Oct 14, 2015

#1**+5 **

Best Answer

Solve the system by using a table

{-0.6x-0.6y=-0.6

{0.5x-0.3y=2.7

A. (4,-3)

B. (-3,4)

C. (-4,-3)

D. (-3,-4)

======================================================================================

I'm not sure how to solve "using a table" [ maybe someone else knows ???]

If we mutiply both equations by 10 to clear the decimals, we have

5x - 3y = 27 .....and.....

-6x - 6y = -6 divide through by -6 and we have x + y = 1 which implies that, y = 1 - x

Substituting this into the first equation, we have

5x - 3(1 - x) = 27 simplify

5x - 3 + 3x = 27

8x -3 = 27

8x = 30

x = 30/8 = 15/4 = 3.75 and y = 1 - 15/4 = -11/4 = -2.75

Mmmmmm...it doesn't look like * any* of these answers work!!! [I checked this with WolframAlpha....my solutions are correct !!! ]

CPhill Oct 14, 2015