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inna [77]
3 years ago
13

4 x plus 8 y equals 40, when y equals 0.8?

Mathematics
1 answer:
kondor19780726 [428]3 years ago
3 0

Answer:

When x = 8.4 and y = .8 then 4x + 8y = 40

Step-by-step explanation:

4x + 8y = 40

y = .8

Let's solve for x by substituting .8 for y (since y is given)

4x + 8(.8) = 40

4x + 6.4 = 40   Subtract 6.4 from both sides.

4x + 6.4 - 6.4 = 40 - 6.4

4x = 33.6  Divide each side by 4

4x/4 = 33.6/4   4 cancels on the left because 4/4 = 1

x = 33.6/4

x = 8.4

So when x = 8.4 and y = .8 then 4x + 8y = 40

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nalin [4]

Given:

\text{ The midpoint of }\bar{AB}\text{ is }M(-2,-6).\text{ Co-ordinates of A are }(1,-4).

Required:

What are the coordinates of B?

Explanation:

We know the mid-point of of line between two points is:

(x,y)=(\frac{x_1+x_2}{2},\frac{y_1+y_2}{2})

Now, let point B(x1, y1)

\begin{gathered} (-2,-6)=(\frac{1+x_1}{2},\frac{-4+y_1}{2}) \\ \text{ Equate Co-ordinates} \\ \frac{1+x_1}{2}=-2 \\ 1+x_1=-4 \\ x_1=-5 \\ and \\ \frac{-4+y_1}{2}=-6 \\ -4+y_1=-12 \\ y_1=-8 \end{gathered}\text{ Point B is }(-5,-8)

Answer:

Hence, (-5,-8) is point B.

3 0
1 year ago
Lines A and B are represented by the equations given below: Line A: x + y = 5 Line B: x + y = 4 Which statement is true about th
sp2606 [1]

If you would like to know which statement is true about the solution to the set of equations, you can calculate this using the following steps:<span>

x + y = 6
x + y = 4
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Answer:

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8 0
3 years ago
Read 2 more answers
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