alassen 3 years ago Choose the system of equations which matches the following graph. MULTIPLE CHOICE

1. alassen

5x + 2y = –14 7x + y = 7 5x + 2y = –14 7x – y = 7 5x – 2y = –14 7x + y = 7 5x – 2y = –14 7x – y = 7

2. nphuongsun93

i would change all the equations to the standard slope form y = mx + b (where m is the slope and b is the y intercept) both the lines cut y-axis at -7 so look for the one that have y intercept = -7

3. alassen

y = 5/2x - 7 y = 7x + 7

4. alassen

y = 5/2x - 7 y = -7x - 7

5. alassen

y = -5/2x + 7 y = 7x + 7

6. nphuongsun93

for the first one it shuold be y = -5x/2 - 7 y = -7x + 7

7. alassen

y = -5/2x + 7 y = -7x - 7

8. nphuongsun93

the 2nd one should be y = -5x/2 - 7 y = 7x -7 you got the signs all wrong o.O

9. nphuongsun93

3rd one: y = 5x/2 + 7 y = 7x + 7

10. alassen

mannn

11. nphuongsun93

haha, anyway 4th one y = 5x/2 + 7 y = 7x - 7 now look at all 4, see which one have y-intercept = -7 (hint: y = mx + b, b is the y-intercept)

12. alassen

i believe the answer is B

13. alassen

because both equations have a y intercept of -7 and on the graph the two lines intersect at 0,7

14. nphuongsun93

ya. intersect at (0, -7) be careful with the signs next time :P b is correct

15. alassen

thank you!