Y 3 is proportional to x, and when x 2, y 7

Solution: Derived from the question.

Because y-3 is directly proportional to x.

So y-3≠0, x≠0

Get: y≠3,x≠0

Let y-3 be proportional to x and t

i.e. y-3 x=t

Substituting x=2, y=7 into y-3 x=t is obtained.

t=2, so the function relation is y=2x+3

When x=4, substitute y=2x+3

Get y=11 and when y=4, substitute y=2x+3

Get x=1 2

Solution: Since y-3 is proportional to x, y-3=kx is obtained from y=kx.

So y=kx+3

When x=2, y=7, so k=2

So the analytic formula of the function is y=2x+3

When x=4, y=11

When y=4, x=1 2

You treat Y-3 as a whole.

Then it is y-3=kx

then y=kx+3

Next, you can substitute the evaluation.

Answer: y=11

, x=1 2

Presumably the answer should be correct.

2.Let x=, the solution is k=2, so y-3=2x, i.e., y=2x+3 let x=4, then y=11

3.Let y=4, then x=1 2

y-3=kx substituting x= into k=2, so the algebraic formula is y=2x+3 x=1 2

y-3 is proportional to x, and y-3=kx(k≠0) is proportional.

Substituting x=2 and y=7 gives 7-3=2k, k=2;

The functional relationship between y and x is: Wang Jianliang y=2x+3,

The so-called proportional group such as 晌 means that the oak space has y+3=k(x+2), where k>0

Replace x=3, y=7Substituting yields 7+3=k(3+2) k=2

So collapse front y = 2x+1

Since y-3 is proportional to x, the parameter a can be set, and y-3=ax

When x=2 and y=7, a=2

Then, the analytic formula of the function of (1) y on x is: y=2x+the range of values is negative infinity to positive infinity.

2) When x=-1, y=1

3) When y is zero, the value of x ranges from negative infinity to negative 3/2.

(1) Let y-3=kx

When x=2 and y=7, substitution obtains.

7-3=2k

k=2y-3=2x

y=2x+3

2) When x=-1 2, y=2x+3=-1+3=2(3) because of the translation, k does not change, let y=2x+b, and the substitution point (2,-1) gets -1=2*2+b

b=-5, so the analytic formula after translation is y=2x-5

Let y-3=kx

When x=2, y=7

7-3=2k

k=2y-3=2x

y=2x+3

When x=-1 2, y=2x+3=-1+3=2, draw the image yourself.

Solution: (1) y-3 is proportional to x, y-3=kx(k≠0) is proportional, when x=2, y=7 is substituted, 7-3=2k, k=2;

The functional relationship between y and x is: y=2x+3, 2) substituting x=-1 yields: -1x2+3=1

3.x is less than.

According to the question search buried state meaning:

y+3=k(x-2)

Substitute x=3 and y=7.

7+3=k(3-2)

k=10y+3=10(x-2)

y=10x-23

Positive proportionality is that the number of liquids increases in proportion to the increase of another number according to the fixed proportion.

(1) Because y-3 is proportional to x.

So let y - 3 = kx

So y=kx+3

Because when x = 2, y = 7

So 2k + 3 = 7

So k = 2

So y = 2x + 3

2) When x = -1 2.

y = 2×(-1/2) +3 = 2

(1) y-3 is proportional to x, y-3=kx(k≠0) is proportional, when x=2, y=7 is substituted into it, and 7-3=2k, k=2;

y＋3=kx

Substituting x=2 and y=7 gets:

7＋3=2k

k = 5 to get y 3 = 5x

y=5x－3

When x = 1 2, y=5 ( 1 2) 3 = 11 2 to make the translated image pass (4, 3), then: y=5x 23 [pan down 20 units].

y+3=kx

When x=2, y=7

7+3=2k,k=5

So y=5x-3

When x=-1 2, y=-11 2

The slope is the same after translation, which is 5

Let y=5x+b

Points (4, -3) are brought in.

20+b=-3

b=-23y=5x-23