Question

Choose the system of equations which matches the following graph.



5x – y = 7
2x – y = 0

5x – y = 7
2x + y = 0

5x + y = –7
2x + y = 0

5x + y = –7
2x – y = 0

Answer 1

any ideas? :)

Answer 2

Think of it like this...look at the x intercept and look at they y intercept.

It can't be the one with the =-7 because the x intercept is positive. So it has to be either the first or the second. One of the slopes on the graph is negative while the other is positive so if we rearrange for the y = mx + b

we get 1) y = -5x - 7
y = 2x
This looks right because one has a positive slope and the other has negative slope.

So it has to be the second one Is wrong because both slopes are negative

2) y = -5x -7
y = -2x

Thus we can say that the second system of equations matches the graph given....I think... you can check yourself to be sure.

Answer 3

so it is B?

Answer 4

@mebs

Answer 5

I believe so

Answer 6

from the picture, the solution is y = -2 and x = 1
so plug those 2 values for each respectively, and test them which one gives you a valid equality :)

Answer 7

i believe correct answer is the third one: 5x - y = 7, 2x + y = 0

you can check this by inserting the values of certain points on the graph in the equation and check if the equation gives the same result as the graph

5x - y = 7 is the equation of the right graph, 2x + y = 0 is the equation of the left graph

example to be sure, choose point (0,0) and (-1,2) of the left graph, insert them in the equation 2x + y = 0:
2*0 + 0 = 0
0 = 0

2*(-1) + 2 = 0
-2 + 2 = 0
0 = 0

left graph equation is 2x + y = 0 :)

now choose (1,-2) and (2,3) of the right graph, insert them in equation 5x - y = 7:
5*1 + 2 = 7
7 = 7

5*2 - 3 = 7
10 - 3 = 7
7 = 7

yes, the correct answer is B :)

Answer 8

yay

im right

Answer 9

mistake in first sentance, not third, second :)