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skad [1K]
3 years ago
8

Solve the systemSolve the system by either substitution or elimination 4x + 4y = 20, 2x -2y = -18 by either substitution or elim

ination
Mathematics
1 answer:
valina [46]3 years ago
7 0
{4x + 4y = 20  | ÷4<span>
{2x -2y = -18   | </span>÷2

{x + y = 5 
{x -y = -9
--------------
2x = -4
x = -2

x + y = 5 
-2 + y = 5
y = 5 + 2
y = 7

The answer is (-2, 7)

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3 years ago
When a number is a multiple of 6, what are the possible values for the ones digits?
Liula [17]
I would do this by first listing the multiples of 6 until I start to see a pattern with the one's digit.
6x0=0
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Notice how the first set of 5 numbers seems as though it repeats in the 6th, 7th, and 8th numbers.  This probably means the pattern continues infinitely so the first 5 numbers are all the one's digits that can come from multiples of 6.  Thus your answer is: 0,6,2,8,or 4 
7 0
3 years ago
If one bag of red grapes costs $2, how many bags can we buy with $18?
const2013 [10]
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8 0
3 years ago
Read 2 more answers
PLEASE HURRY<br><br> 9x^2 + 64 = 0<br><br> I NEED THE WORK SHOWN IN ORDER TO GET CREDIT
seropon [69]

Answer:

x = ± \frac{8}{3} i

Step-by-step explanation:

subtract 64 from both sides

9x² = - 64 ( divide both sides by 9 )

x² = - \frac{64}{9} ( take the square root of both sides )

x = ± \sqrt{-64/9} = ± \frac{8}{3} i


6 0
3 years ago
Read 2 more answers
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