Question

PLEASE HELP ME


Solve, using linear combination.
5x + 2y = -4
-3x + 2y = 12


A. (-2,3)
B. (0,-2)
C. (2, -7)
D. (4,0)

Answer 1

@triciaal @iambatman @One098 @pooja195 @Abhisar @ShadowLegendX @Directrix @Compassionate @bibby @mathmath333

Answer 2

Plug in each of them until one of the pairs solves the linear equations.

Answer 3

@One98 and if not given the choices?

Answer 4

Try each one until you find it. it is really easy

Answer 5

A

Answer 6

@triciaal Yeah, I know what you mean, but I was just telling her that since she does have choices, you just plug them in.

Answer 7

I got A

Answer 8

@JimStanSGC Leave.

Answer 9

@laylaflower
to solve by combination the object is to make the coefficients of one variable be equal and opposite so they will cancel out when added. this will give one equation with one unknown variable. solve then substitute in either of the originals to solve for the other variable.

Answer 10

Your correct A

Answer 11

thank you all ! :)

Answer 12

Your welcome

Answer 13

you can multiply the first equation by 2 and get rid of variable y by adding both equations together
you get
12x-4y = 10
5x + 4y = 24
17x = 34
x must be 2
if x = 2 then you plug into the equation
12 - 2y = 5
7 = 2y
y must be 3.5
i think this is right ..........

Answer 14

for this one just subtract since the y's are equal
solve for x
8 x = -16 so x = -2

Answer 15

http://openstudy.com/study#/updates/54b2a7dbe4b0dbc68afeefd1

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