Find the value of y when x equals 4, -3x+9y=-57

Answers

Answer 1

Answer: -12 + 9y = -57

add 12 to both sides, 9y = -45

divide 9 from both sides to isolate the y

y = -5

Answer 2

Answer: -3(4)+9y=-57
-12+9y=-57
9y=-45
y=-5

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How do you solve y=2.5x+5

Which is a factor of x2 + 8x – 48?

Answers

so x^2+8x-48
it can be written in the form
ax^2+bx+c

so since the 'a' term=1 we want it in form
(x +/- something1 )(x +/- something2 )
so basically, something1 times something 2=c and something 1+something 2=b

c=-48
b=8

factor -48 and fiind what 2 factors add to 8 (obviously one has to be positive and is 8 more than the negative [negative is smaller])
-48=
-1 times 48 no
-2 times 24 no
-3 times 16 no
-4 times 12 yes
-4+12=8

therefor it is
(x-4)(x+12) or (x+12)(x-4)

so the answer would be the one with either (x+12) or (x-4) (since you didn't include answer choices)

(x+12) or (x-4) would be the right choice

this trinomial factored is:
(x + 12)(x - 4)
either of these would be considered a factor.

PLEASE HELP PLEASE PLEASE PLEASE

Answers

Just plug in the domain values in the equation to find y.

f(x)=-x+4

f(-3)=-(-3)+4=3+4=7
f(-2)=-(-2)+4=2+4=6
f(-1)=-(-1)+4=1+4=5
f(1)=-1+4=-1+4=3

So the range is Option B : {7, 6, 5, 3}

How to create a proportional relationship that constant of proportionality equal.to 0.8 ?how to create a proportional relationship that constant of proportionality equal.to 0.9 ?

Answers

Answer:

y = 0.8x
y = 0.9x

Step-by-step explanation:

A proportional relationship is described by the equation ...

y = kx

where k is the constant of proportionality.

For a constant of proportionality of 0.8, the relation is ...

y = 0.8x

For a constant of proportionality of 0.9, the relation is ...

y = 0.9x

Can Miguel use 3/4 inch strips to make a line that is exactly 5 inches long.Explain

Answers

No:
0.75+0.75=1.5
1.5+0.75=2.25
2.25+0.75=3.00
3.00+0.75=3.75
3.75+0.75=4.50
4.50+0.75=5.25

2(3x+4y)=4x+12y
solve

Answers

6x + 8y = 4x + 12y
6x - 4x = 12y - 8y
2x = 4y
x = 2y

is it x=2y?
Because 6x+8y=4x+12y
=>2x+8y=12y
and 2x=4y, so x=2y

If each face is a unit square (1x1), what is the surface area of the cube?

Answers

the surface area is 6 because you multiply the area of one side of the cube by the number of sides it has, which is 6.
1 x 6 = 6

Answer:

The unit square would be 6.

Step-by-step explanation: