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Lisa [10]
3 years ago
8

Find the sum. Express your answer in simplest form. 4x+6/y^2-9 + 8x-7/y^2-9

Mathematics
2 answers:
Amanda [17]3 years ago
7 0
It looks like you already have a common denominator (y^2-9). So, you can just add the two numerators and put that over the common denominator. Hope this helps!
nadya68 [22]3 years ago
4 0
2(2x+3) 8x-7
----------- + --------
(y-3)(y+3) (y-3)(y+3)

=2(2x+3)+8x-7
-------------------
(y-3)(y+3)

= 12x-1
-------------
(y-3)(y+3)
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D because it’s D give me brainless

Step-by-step explanation:

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2 years ago
Your food bill comes to $68.26. If the tax rate is 7%, calculate the amount of tax your family will pay.
romanna [79]
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6 0
3 years ago
Read 2 more answers
Is 7/18 rational or irrational
kramer

Answer:Rational

Step-by-step explanation: It is rational because it is repeating but not random like pi.

4 0
3 years ago
A cake company makes chocolate and vanilla cakes. The ratio of chocolate cakes to vanilla cakes is 3:4. What is the ratio of the
aleksley [76]

Answer:

4:7

Step-by-step explanation:

4:7

they make 7 cakes in total (3:4 = 7).

there are 4 vanilla cakes.

therefore, the ratio of vanilla cakes to the total number of cakes is 4:7.

6 0
2 years ago
What is the equation of a line perpendicular to:
Nataly [62]

Step-by-step explanation:

"perpendicular" means it creates a right angle (90°) with the original line.

a key element is the slope (the incline) of the line.

it is the factor of x (here 1/4 for the original line) and is defined as the ratio of "y coordinate change / x coordinate change" when going from one point on the line to another.

the given slope of 1/4 means that for every increase in x by 4 units y increases by 1 unit.

now if you want to draw a few random lines, and then draw lines that cross them with a right angle, you will see very quickly the relationship of the slopes of the crossing lines :

for the slope of the perpendicular line x and y of the original slope trade places (the ratio turns "upside-down") and the sign of the slope flips (if the original line goes up, then the perpendicular line goes down and vice versa. so + turns into -, and - into +).

so, our original slope 1/4 turns into -4/1 = -4.

we still have infinite possibilities to draw such a perpendicular line (more up or more down on the coordinate grid).

to finally "nail" one particular line we need to use the given point and solve for the y-intercept.

the general slope-intercept form is

y = ax + b

a is the slope, b is the y-intercept (the y value for x = 0).

so, using the slope (-4) and the point (2, 5) we have

5 = -4×2 + b = -8 + b

13 = b

so, the full equation is

y = -4x + 13

7 0
2 years ago
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