## iraqichick89 4 years ago im having a really hard time solving and graphing liner equations... plz help!!

1. beens

??..wat you don't understand?

2. amistre64

wait til you have to make a curve :)

3. beens

true

4. iraqichick89

i dnt know how to solve them

5. beens

do u mean finding the y and x intercepts?

6. amistre64

give us something to work with....

7. iraqichick89

like y + x = -7

8. amistre64

Do you know all the parts to this equation: y = mx + b

9. iraqichick89

no i dont understand that part

10. amistre64

y stands for the value of your "y" coordinate. m stands for the way the line slopes; called the slope. x stands for the value of the "x" coordinate. b is the value of where the line crosses the y-axis. does any of that make sense?

11. iraqichick89

it makes some sence... i just get confused when it comes to solving more then graphing.

12. amistre64

as long as you can get an equation to resemble this construction (y = mx+b) then you can solve for any point on the line. Lets take your equation you gave us for an example...

13. amistre64

y + x = -7 ; do you know how to make this look more like (y=mx+b)?

14. iraqichick89

do u have yahoo messanger??

15. amistre64

nope...

16. iraqichick89

ok sorry my daughter is messinga round

17. iraqichick89

so when i read in the book its so confusing on how to solve these probelms can you show me step by step what to do?

18. amistre64

I can try: In essense; we want to know what values to make "y" for any given value of "x". In your equation; we have: y + x = -7 use algebraic techniques to solve for "y"; which in this case just means subtracting (x) from both sides to get: y +x-x = -7-x y = -x -7 ; which resembles our (y = mx + b) Do you understand it so far?

19. amistre64

Once we have any two points that we can connect together; we can form a straight line. Many times, those two points will be where the line crosses the y-axis; and where the line crosses the x-axis. These crossing points are called "intercepts" becasue it is where the line actually gets intercepted by the x or y axis.

20. iraqichick89

ok

21. amistre64

What two points (called coordinates) can you come up with using : y = -x -7 in order to connect and make a line?