SOLUTION: I need help with Lines. Question is: Find the slope and y-intercept of each line. y = 2x + 3 I have the answer in the book, However I want to know how they came up with it? Answe

Question 4145: I need help with Lines.
Question is: Find the slope and y-intercept of each line. y = 2x + 3 I have the answer in the book, However I want to know how they came up with it? Answer:Slope = 2
y-intercept = 3
Thank you
Answer by longjonsilver(2297) (Show Source): You can put this solution on YOUR website!
this looks fine so far: . Now multiply all the brackets out:

. Now hopefully this factorises nicely. If not --> have to use the quadratic formula. Luckily, it does factorise into:

(3x + 14)(x - 2) = 0

so, 3x+14 = 0 or x-2 = 0

so 3x = -14
--> x = -14/3...mathematically correct but physically wrong for our question.

and the other solution is x=2.

AND NOW check your answer: 3 fields are 2, 3 and 5 km so their areas are: 4, 9 and 25 km^2 --> total is 38km^2, which is correct.

jon.

RELATED QUESTIONS
I need help with Lines. Question is: Find the slope and y-intercept of each line. y =... (answered by longjonsilver)

I need some help on how they come up with this answer as follows #33 2,(0,3) the... (answered by scott8148)

I have two problems I need help with. WIll you please help me.The problems are as... (answered by ankor@dixie-net.com)

I REALLY need help with parallel & Perpendicular lines! Here's what it says: Write an... (answered by ankor@dixie-net.com)

I'm not real sure what catergory I should have put this question in, but I'm really... (answered by rapaljer)

I really need your help in solving this problem. I appreciate your time and efforts. Have (answered by ewatrrr)

I have an algebraic principles question: Write an equation in slope-intercept form of... (answered by jojo14344)

I have some true and false question that I need help with and here they are 1.Any... (answered by drk)

ok i need help with graphing slope and y-intercept the equation is... (answered by rfer)