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4 years ago

The difference of two numbers.(a,b) is 21. The difference of 5 times a and 2 times b is 18. What are the values of a,b?

Mathematics

1 answer:

ziro4ka [17]4 years ago

7 0

The equation is b-a= 21;
2b-5a = 18
a=8 and b= 29
therefore 29-8= 21
2 (29) -5 (8) = 18
58-40=18

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When Rafael emptied his pockets, e found he had a total of $3.50 in quarters and nickels. If he had 8 more quarters that nickels

jasenka [17]

You can use systems of equations for this one.

We are going to use 'q' as the number of quarters Rafael had,
and 'n' as the number of nickels Rafael had.

You can write the first equation like this:
3.50=0.05n+0.25q
This says that however many 5 cent nickels he had, and however many
25 cent quarters he had, all added up to value $3.50.
Our second equation is this:
q=n+8
This says that Rafael had 8 more nickels that he had quarters.

We can now use substitution to solve our system.

We can rewrite our first equation from:
3.50=0.05n+0.25q
to:
3.50=0.05n+0.25(n+8)

From here, simply solve using PEMDAS.

3.50=0.05n+0.25(n+8)     --Distribute 0.25 to the n and the 8
3.50=0.05n+0.25n+2     --Subtract 2 from both sides
1.50=0.05n+0.25n     --Combine like terms
1.50=0.30n     --Divide both sides by 0.30
5=n     --This is how many NICKELS Rafael has.

We now know how many nickels he has, but the question is asking us
how many quarters he has.

Simply substitute our now-known value of n into either of our previous
equations (3.50=0.05n+0.25q or q=n+8) and solve.

We now know that Rafael had 13 quarters.

To check, just substitute our known values for our variables and solve.
If both sides of our equations are equal, then you know that you have
yourself a correct answer.

Happy math-ing :)

5 0

3 years ago

Solve for h.<br>3/7 = h/14 - 2/7

AleksAgata [21]

Answer:

Step-by-step explanation:

Multiplying both sides by 14

2*3=h-(2*2)

6=h-4

h=6+4

h=10

3 0

3 years ago

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Melinda rod her bike 54/100 mile to the library. then she rode 4/10 mile to the store. how far did Melinda ride her bike in all?

Lady_Fox [76]

94/100 miles is the answer. I dont know what form you wanted the answer in but yeah.

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3 years ago

use the slope formula to find the slope of the line that goes through the points (5, 0) and (-5, 2). 0. -5. −15. undefined.

dsp73

Answer: The slope is 5.

Step-by-step explanation:

3 0

3 years ago

Which equation is related to the given equation? column a column b 1. 61 + 18 = z 2. z = 61 – 18 3. –18 = 61 – z 4. 18 = 61 – z

Fofino [41]

Question 1.).

Column A.):

Answer ==> z = 61 – 18, is Related to z + 18 = 61, ==> z = 43

Answer: ===> 18 = 61 - z, is Related to z + 18 = 61, ===> z = 43

z + 18 = 61

Let's solve your equation step-by-step.

z + 18 = 61

Step 1: Subtract 18 from both sides.

z + 18 − 18 = 61 − 18

z = 43

Graph: ========> z + 18 = 61 =========> z =======> 43

Column (A), Answer: =======> z = 43

Question 2.).

Column. B.):

Answer: =====> 61 + 18 = z, Related to z - 18 = 61 ====> z = 79 Answer: ===> –18 = 61 – z, Related to z - 18 = 61 ====> z = 79

z - 18 = 61

Let's solve your equation step-by-step.

z − 18 = 61

Step 1: Add 18 to both sides.

z − 18 + 18 = 61 + 18

z = 79

Answer z = 79

Therefore, The answers to your Equation: Column (A),/Column (B)

Question 1.).

Column A.):

Answer ==> z = 61 – 18, is Related to z + 18 = 61, ==> z = 43

Answer: ===> 18 = 61 - z, is Related to z + 18 = 61, ===> z = 43

Question 2.).

Column. B.):

Answer: =====> 61 + 18 = z, Related to z - 18 = 61 ====> z = 79 Answer: ===> –18 = 61 – z, Related to z - 18 = 61 ====> z = 79

Hope that helps!!!!!!!! : )

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3 years ago

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