What is a possible first step to eliminate the variable x in the following system?
2x – 7y = 3
4x + 5y = –2

Question

What is a possible first step to eliminate the variable x in the following system?
2x – 7y = 3
4x + 5y = –2

directrix · Answer

Multiply each member of this equation by (-2) and post the result here.

Equation: 2x – 7y = 3

anonymous · Answer

Top one by -2 :)

-4x + 14y = -6
4x  + 5y = -2

19y = -8 and you can work it from there :)

directrix · Answer

@ryan.g.campbell.17   ---> This question was for the Asker and not for your deus ex machina. Read the Code of Conduct.

@raebaby420
Yes. The objective in the Addition/Subtraction method of solving simultanteous linear equations is to multiply by a number that will cause the coefficient of the variable you wish to eliminate to add out.

anonymous · Answer

Ok.. so i think i understand it

anonymous · Answer

Soo i just gotta single out my coefficient?

directrix · Answer

@raebaby420
Let's try another one. Same instructions. Answer?

3x + 4y = 7
3x - 4y = 10

anonymous · Answer

umm haha i have no clue.

anonymous · Answer

whats the first step i have to complete?

directrix · Answer

Question: What added to 3x gives 0?

(3x) + ? = 0
? =