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marissa [1.9K]
2 years ago
8

Y=-1,X+2y=9 solve by substitution show all work

Mathematics
1 answer:
Inga [223]2 years ago
4 0

Answer:

x = 11

Step-by-step explanation:

Substitute y = -1 into the equation.

x+2y = 9

; x+2(-1) = 9

x+(-2) = 9

x-2 = 9

x = 9+2

x = 11

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Subtract 7x-9 from 2x^2-11<br> A) 2x^2-7x-2<br> B) 2x^2+7x-20<br> C) 2x^2+7x-2
Natali [406]
We keep the 2x^2 because we can only subtract something from that if it also is squared. From there, we subtract the 7x from 2x^2-11. Since there is no previous x's in the 2x^2-11, we just make it -7x. So, without even continuing the problem, we see that A) is the correct answer because it is the only one with -7x. 
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3 years ago
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The sum of two numbers is 5.036. One number has a4 in the tenths place and a 7in the thousandths place. The other number has a 1
wlad13 [49]
The sum of two numbers 5.036.
first number: one number has 4 in the tenths place, 7 in the thousandths place.
=> x.4x7
2nd number: 1 in ones place and 2 in the hundredths place.
=> 1.x2x
Now, we have the 2 numbers with given clues:
=> x.4x7 + 1.x2x, where x is the missing number.
Note that in adding numbers, we start from the right most.
=>x.4x7 + 1.x2x = 5.036
=> x.4x7 + 1.x29
=> x.407 + 1.x29
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=> 5.036



8 0
3 years ago
H = ac + mn solve for n
notka56 [123]

Answer:

n =  \frac{h - ac}{m}

Step-by-step explanation:

h = ac + mn

mn = h - ac

n =  \frac{h - ac}{m}

6 0
9 months ago
What are the greatest numbers : 4, -8, 4, 8, 7, -3, -9, 2, 6, 1, -5, 5, -2, 0.
myrzilka [38]

Answer:

Step-by-step explanation:

I would say 8 is the greatest number

the order from least to greatest

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7 0
3 years ago
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