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Solnce55 [7]
3 years ago
10

Solve the system of equations by substitution. Show all work neatly on your work page. Checking your answer is wise. :) Plz need

this for a test
3x + 2y = 7

y = -3x +11
Mathematics
1 answer:
vivado [14]3 years ago
7 0

Answer: x = 1

3x + 4 = 7

subtract 4 from both sides

3x = 3

x = 3/3 = 1

You might be interested in
A man has two more nickels than dimes. He has $1.15 in all. How many coins of each kind does he have?
zhannawk [14.2K]

Answer:

Man has 9 Nickels and 7 dimes.

Step-by-step explanation:

Let Number of dimes be x

and Number of Nickels be y

As Per given data he has two more nickels than dimes.

y= 2+x\\

As we know that

1\$ = 100 cent

1 nickel is worth = 5 cents = \frac{5}{100}= 0.05\$

1 dime is worth = 10 cents = \frac{10}{100} 0 .1\ $

According to given data he has \$\ 1.15 total nickel and dimes

So the equation becomes,

0.05y+0.1x=1.15

but y= 2+x

0.05(2+x)+0.1x=1.15\\0.1+0.05x+0.1x=1.15\\0.1+0.15x= 1.15\\0.15x= 1.15-0.1\\0.15x=1.05\\x=\frac{1.05}{0.15}= 7

Substituting value of x in equation y = 2+x we get

y= 2+7 =9

Man has 9 Nickels and 7 dimes.

5 0
3 years ago
15 For exercise, Cindy swims every 6 days and jogs every 8 days. She did both today.
Drupady [299]

Answer:

24 days

Step-by-step explanation:

To find the answer we need to find the LCM

first, find the prime factorization of 6 and 8

6=2*3

8=2^3

8*3=24

So she'll swim and jog on the same day in 24 days

6 0
3 years ago
Can you round 691 to 1 significant number
a_sh-v [17]

Answer:

yes its 700

Step-by-step explanation:

5 0
3 years ago
The bike store marks up the wholesale cost of all of the bikes they sell by 30%.
Luda [366]
$87.5 i believe (sorry if it is wrong)
5 0
3 years ago
Read 2 more answers
How many solutions does 9x^2-12x+4=0 have?
Westkost [7]
9x^2-6x-6x+4=0 
<span>3x(3x-2)-2(3x-2)=0 </span>
<span>(3x-2)(3x-2)=0 </span>
<span>x=2/3


I hope I helped you!  I hope I can help you more in the future! Have a blessed day!</span>
7 0
3 years ago
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