giup em voi

• em hien gio hoc lop 7 ..he hoc high school math ma kho qua nen len day nho may anh chi giup.
1.. find the slope of the line containing the points (2,5) and (4,9)

2. what us the equation in the stanđar form of the line through (4,1) and (-2,3)

3. fin an euqation of the line in points slope form that passes through (4,3) and is parallel to the line 3x-y=7

anh chi nao gioi ve math thi pm cho em voi nhe

• A) equation to find the slope of the line is y2-y1/x2-x1

B) standard form is y=mx+b (find the slope first) m is slope

C) i think i'm forgetting sumtin

• emday wrote:A) equation to find the slope of the line is y2-y1/x2-x1

B) standard form is y=mx+b (find the slope first) m is slope

C) i think i'm forgetting sumtin

cho em cai step duoc khong

• A) 9-2/4-2 = 5/2 is your slope

• 3. 3x - y = 7 ----> y = 3x - 7 (where 3 is the slope, -7 is the x intercept)

point (4, 3) with slope = 3
The equations of the line would be y-y1 = m (x - x1) (where (y1,x1) = (4,3)
i think you can finish this, anyway u should get more study forgive me to say that just want you to be better

• cái này wá là dzể luôn .. TT nói giống như cadao .. đọc trong sách là hiểu liền .. nhưng TT help bạn giải ra nhé ..

1. find slope, m= slope, and point là (2,5) and ( 4,9)

find m=y2-y1/x2-x1 then we have m=(9-5)/(4-2) =4/2 = 2, so m = 2

2. standar form of line through (4,1) and (-2, 3)

first we have to find slope: m=y2-y1/x2-x1, so we have m= (3-1)/(-2-4) = 2/-6 = -1/3 so m = -1/3

so we put in equation : y=mx + b

we have x,y, and m, but no b .. so we have to find b, so b = y1-m(x1), then we have b=1 - (-1/3)(4) = 1+ (4/3) = 7/3, so b= 7/3

so we have equation : y= -1/3x+ 7/3

test: (4,1) >>> 1= -1/3(4)+7/3 ; 1= -4/3+ 7/3 = 3/3 = 1

test: (-2,3) >>>> 3= -1/3(-2)+7/3 ; 3=2/3+ 7/3 ; 3=9/3 or 3=3

3. 3x-y=7 so we have y=3x-7

to find equation, we need b, so to find b , we have equation for b is :b = y1-m(x1),

we have m= 3, x=4, and y= 3, so in the equation we have 3-(3)(4) =3-12= -9

the new equation is y=3x-9 or 3x-y=9

check: 3=3(4)-9 = 3=12-9 or 3(4) -3 = 12- 3 = 9 .

chúc bạn may mắn ..

• emday wrote:A) 9-2/4-2 = 5/2 is your slope
chỉ sai rồi đó emday ..

• em nó học lớp 7 mà, đương nhiên là bài dễ đối với mấy anh chị lớp lớn hơn rùi, đừng nói vậy mai mốt mấy em hông dám hỏi bài mấy anh chị nữa. Nhưng mấy em cũng đừng có ỉ lại, vậy thôi.