Question

Solution

1

For $3x+y+4=0$: when $x=0$, $y=-4$; when $x=-1$, $y=-1$; when $x=-2$, $y=2$

+1 mark

2

For $3x-y+2=0$: when $x=0$, $y=2$; when $x=-1$, $y=-1$; when $x=1$, $y=5$

+1 mark

3

Graph showing lines 3x + y + 4 = 0 and 3x - y + 2 = 0 intersecting at (-1, -1)

+2 marks

4

Correct solution: $x=-1$, $y=-1$

+1 mark

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