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Nana76 [90]
3 years ago
9

How to do question 13

Mathematics
2 answers:
Oksanka [162]3 years ago
6 0
How do you take pictures and do that ??
Evgen [1.6K]3 years ago
6 0
I am sorry i do not know the answer but i hope someone can help u!!!!!! ;) ;) :) :)
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Solve the system by substitution x=-8y-15 2x+5y=-8
Ghella [55]

To solve this system by substitution, we must substitute in the value we are given for x in terms of y (the first equation) into the second equation.  This is modeled below:

x = -8y - 15

2x + 5y = -8

2 (-8y - 15) + 5y = -8

Now, we should solve this new equation for y.  To begin, we should use the distributive property to get rid of the parentheses on the left side of the equation and begin the simplification process.

-16y - 30 + 5y = -8

Next, we can combine like terms on the left side of the equation by adding together the two terms that both contain the variable y.

-11y - 30 = -8

Next, we should add 30 to both sides in order to move all of the constant (number) terms to the left side of the equation.

-11y = 22

After that, we should divide both sides of the equation by -11 in order to get the variable y alone.

y = -2

Now, we can substitute our value for y back into one of our original equations (it doesn't matter which one you choose; they will yield the same answer).

x = -8y - 15

x = -8(-2) - 15

To simplify, we should following the order of operations outlined by PEMDAS and compute the multiplication and then the subtraction.

x = 16 - 15

x = 1

Therefore, the answer to the system is x = 1 and y = -2, or (1,-2) when written as an ordered pair.  

Hope this helps!

3 0
3 years ago
Read 2 more answers
Can someone help me with this please
MrRa [10]
You first have to convert the 5 tons to pounds.
Once you have done that step you simply add.

5 0
3 years ago
Which of the following is a solution of 4x2 = − 9x − 4?
mestny [16]
The solution is -0.609611 and -1.64, I do not think you can simply find this by factoring but the only way is graphing it
8 0
3 years ago
Read 2 more answers
£90 was spent on a new chair for an office. This represented 6% of the total spent on furniture. How much was spent on furniture
ad-work [718]

Answer:

£1500

Step-by-step explanation:

\frac{100}{6}  \times 90 = 1500

8 0
2 years ago
A homeowner has 5 zucchini plants in her garden. Over the course of the season, the yields (number of zucchinis per plant) are:
const2013 [10]

Answer:

Average = 16, standard deviation =

Step-by-step explanation:

15+12=27

27+(17+14)+22=27+31+22=80

80/5=16

Distance from 22 to 16=6, from 12 to 16=4, so deviation = 5

8 0
3 years ago
Read 2 more answers
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