Question

Which of the below systems of equations matches the following graph?


x – y = 1
3x – 2y = 8

x – y = –1
3x + 2y = –8

x + y = 1
3x – 2y = 8

x + y = –1
3x + 2y = –8

Answer 1

The graph is attached below

Answer 2

ur graph is too small to see and u will just have to solve the equations first.

Answer 3

JayDS if u click the link it becomes bigger :)

Answer 4

for the first one of
x-y=1
3x-2y=8

we can firstly rearrange x-y=1 to be
x=1 + y
so y=x-1
then we sub y=x-1 into the second equation of 3x-2y=8
3x-2(x-1)=8
3x-2x+2=8
x=8-2
x=6
now sub x=6 back into either equations, lets choose y=x-1
so y=6-1
y=5
so the point of intersection here is (6,5)

Answer 5

and sorry, what you said for your graph does not work.

Answer 6

oh okay im sorry

Answer 7

Do you understand what I did for the first example?

Answer 8

yea :)

Answer 9

ok now, do it for the rest.

Answer 10

umm...i think the answer is a..........??

Answer 11

is it? :D

Answer 12

nope.

Answer 13

did u actually solve it?

Answer 14

you can never just guess.

Answer 15

i did solve it....didnt just guess

Answer 16

the point of intersection is (-2,-1) on the graph so you have to solve all the equations to find their point of intersection that matches that.

Answer 17

It is clearly not the first one because as I solved above the point of intersection is (6,5)

Answer 18

so go through your working out again and re-do it if you have to.

Answer 19

I have to go but just use your calculator to check afterwards if you are correct or not by plotting both equations each time and looking at the graph.