Question

find the y- coordinate of the point of intersection of the lines
-2x-3y=1
5x + 2y =1

Answer 1

since we need to find y co-ordinate,
lets try to eliminate 'x'

do you know the method of elimination?

Answer 2

we eliminate the 2x and the 5x

Answer 3

lets start by multiplying 1st equation by 5

multiply each term of -2x-3y=1 by 5
what do u get?

Answer 4

-10x-15x=5

Answer 5

good!

now multiply each term of 5x+2y=1 by 2

so that you get 10x for this too!

Answer 6

then all you have to do is just add the 2 new equations :)

Answer 7

10x -5y=10

Answer 8

did you multiply each term by 2?

Answer 9

5x+2y =1

2*5x + 2*2y = 2*1
....

Answer 10

ooops! -7/11

Answer 11

correct :)