Question

how to solve
4(3x-y) = 9x + 5
3(2x+3y) = 13(x+y-5)

Answer 1

@mathmale

Answer 2

@e.mccormick

Answer 3

@Mashy

Answer 4

@PinkSapphire

Answer 5

no the my options are differenrt

Answer 6

@ememlove

Answer 7

what are your options?

Answer 8

(7,4)
(10,6)
(-3,2)
(3,-2)

Answer 9

@ganeshie8 @Gabylovesyou @kingdeolt

Answer 10

oh its like that :D
I did not realise this was simultaneous equations :D
i thought you have to solve to find two equations of a line :P.

Answer 11

First line simplifies to
3x - 4y - 5 = 0
Second line simplifies to
7x +4y -65 = 0

If you add these together,
10x - 70 = 0
10x = 70
x = 7.

Well if x=7 then its your first choice answer :)

Answer 12

But you can check for y, sub into equation 1
3(7) - 4y - 5 = 0
21-5 = 4y
16 = 4y
y = 4

so (7,4)

Answer 13

im getting -7x

Answer 14

what do you do and how do you get it?

Answer 15

I wrote pretty much the whole working out, so check in it,maybe you made a mistake along the way.

Answer 16

it will be great if u show me the working from the starat

Answer 17

You mean simplification of equations
well in second one 3(2x+3y) = 13(x+y-5)
multiply out the brackets
6x + 9y = 13x + 13y - 65
take away 6x and 9y from both sides
7x + 4y - 65 = 0.

Answer 18

thx was going wrong there