Finding where lines meet? (1 Viewer)

[adidasboy]

ahh fkk this is embarassing lol
forget maths from year 9. Don't laugh
Sketch x-y=4 & 2x+3y=3

x=4, y=-4.

x= 3/2, y=1



Where do lines meet?
don't bother sketching it lol
whats the formula to work this q out? can't rmbr at all.

Sorry for such a stupid question, =="
I can't find my previous years textbooks

 

[tommykins]

Equate the equations together.

x - y = 4 (1)
2x+3y = 3 (2)

x = 4+y

Sub into (2)
2(4+y) + 3y = 3
8 + 2y + 3y = 3
5y + 8 = 3
5y = -5
y = -1

Subbing this into (1)

x-(-1) = 4
x+1 = 4
x = 3.

Therefore they interesect at (3,-1)

 

[adidasboy]

Oh okay
Thanks guys for the prompt replies!