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san4es73 [151]
3 years ago
9

What is the value of the expression 5x – x + 8 when x = 2?

Mathematics
2 answers:
madreJ [45]3 years ago
8 0

Answer:

16

Step-by-step explanation:

5x - x + 8

5(2) - 2 + 8

10 - 2 + 8

8 + 8

16

Shtirlitz [24]3 years ago
6 0

The answer is 16 I am sure

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A straight line, L, is perpendicular to the straight line y=2x-1 and passes through the point (8,1). Find an equation of L
luda_lava [24]
Let's call that other line with the eqn. y=2x-1 line M.
This line is in slope-intercept form, which means that it is written in the form y=mx+b where m is the slope and b is the y-intercept.
This means that the slope of line M is 2.

Perpendicular lines have slopes which are opposite reciprocals.
(that is to say, if you flipped the fraction and changed the sign)

Of course, 2 isn't a fraction, but it's implied as 2/1.
The opposite reciprocal would then be -1/2.
Let's plug this into our slope-intercept form equation for line L.

y = mx + b
y = -1/2x + b

Of course, we still need to find that y-intercept. (y when x = 0)
To do this, we need to interpret the slope.
Slopes are rise over run, so m = -1/2 means a change of -1 in y = 2 in x.
Let's take a point we know is in our line, (8, 1).
To find that y-intercept, we want x to be 0.
To do this, we'd have to subtract 8 from x.
And according to our slope, this means adding 4 to y.
Our y-intercept is at (0, 5), with the value b that we use being just 5.

\boxed{y=-\frac{1}2x+5}
7 0
3 years ago
Please help!!!
sasho [114]

Answer:

B!

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
HELP PLEASE!!
zhenek [66]

Answer:

y = 1/2x + 1.

Step-by-step explanation:

Use the point-slope form of a straight line:

y - y1 = m(x - x1)     (where m=slope and(x1,y1) is a point on line).

y - 3 = 1/2(x - 4)

y = 1/2x - 2 + 3

y = 1/2x + 1.

7 0
3 years ago
Write the equation of the line through (3,9) and (-2,9)
strojnjashka [21]

Answer:

y = 9

Step-by-step explanation:

y-y1 = m(x-x1)

m is the slope =y2-y1/x2-x1=9-9/-2-3=0

pick any number out of the given two for (x1, x2)

y-9 = 0*(x-3) so

y-9 = 0 add 9 to both sides

y = 9

5 0
3 years ago
Marco is working with the equation s=kw his teacher told him that’s a varies directly with w if Marco substitutes 300 for s and
aniked [119]

Answer:

 S = kpq 280 = k(5)(7) 280 = 35k 8 = k

5 0
3 years ago
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