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aliya0001 [1]
4 years ago
10

7x+2y=3 and x-3y=30, what is the value of y?

Mathematics
1 answer:
lys-0071 [83]4 years ago
8 0

Answer:

x=3

Step-by-step explanation:

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: Diego is collecting dimes and nickels in a jar. He has collected $22.25 so far. The relationship between the numbers of dimes
Troyanec [42]

Answer:

A. (0,445)

D.(118,209)

E.(172,101)

Step-by-step explanation:

The equation that we have in this problem is:

0.10d + 0.05n = 22.25

where

d is the number of dimes

n is the number of nickels

$22.25 is the total amount of money collected by Diego in the jar.

In order to find which pairs of values can be solutions to the equation, we just need to substitute each pair (d,n) into the left term on the equation, and check if the result is 22.25. Let's do it:

A. (0,445)

0.10\cdot 0 + 0.05\cdot 445 =0+22.25=22.25 --> YES

B. (0.50,435)

0.10\cdot 0.50 + 0.05\cdot 435 =0.05+21.75=21.80 --> NO

C. (233,21)

0.10\cdot 233 + 0.05 \cdot 21 =23.3+1.05=24.35 --> NO

D.(118,209)

0.10\cdot 118 + 0.05\cdot 209 =11.8+10.45=22.25 --> YES

E.(172,101)

0.10\cdot 172 + 0.05\cdot 101 =17.2+5.05=22.25 --> YES

So the correct pairs are:

A. (0,445)

D.(118,209)

E.(172,101)

3 0
3 years ago
. X +7 x +3 multiply binomials
vaieri [72.5K]

Answer:

8x+3

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
Mark and Bonnie both make $11 per hour working for their parents. If they combine their efforts and work for the same amount of
Mademuasel [1]
To answer this we would need the expressions given.
5 0
3 years ago
Kiesha measures snakes in a wildlife preserve to the nearest quarter inch. She records the data in a dot plot, shown below. How
hoa [83]

Answer:

Carol has only 20p and 10p coins in her purse.

She has three times as many 20p coins as 10p coins. If Carol has £4.20 altogether, how many 20p coins does she have?

3 0
3 years ago
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Juan compró un led TV en cuotas que costó $ 76.000=. Si le falta pagar 3 cuotas y ya pagó $ 47.000, ¿Cuál es el valor de cada cu
Murrr4er [49]

Respuesta:

$ 9666. 67

Explicación paso a paso:

Costo de TV = $ 76,000

Número de cuotas = 3

Monto ya pagado = $ 47000

Amontof cada cuota fija = Cantidad que queda por pagar / 3

Cantidad que queda por pagar = Costo de TV - Cantidad ya pagada

Cantidad que queda por pagar = $ (76000 - 47000) = $ 29000

Monto de cada cuota fija = $ 29000/3 = $ 9666. 67

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