Question

Choose the system of equations which matches the following graph.



3x + 7y = 7
5x + 7y = –63

3x + 7y = 7
5x – 7y = –63

3x – 7y = 7
5x + 7y = –63

3x – 7y = 7
5x – 7y = –63

Answer 1

firstly - do you know what an equation of a line looks like in slope/intercept form?

Answer 2

if you don't then you can use another strategy which involves looking at where the lines cross the x and y axes

Answer 3

e.g. one of the lines crosses the y axes at y=9. this implies for that line when x=0, y=9.
which one of the equations above satisfies this condition?

Answer 4

1rst?