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Lerok [7]
3 years ago
15

Solve by substitution -2x+4y+6=0 x-5y+3=0

Mathematics
1 answer:
dsp733 years ago
7 0
-2x+4y+6=0 \\
x-5y+3=0 \\ \\
\hbox{solve the 1st equation for x:} \\
-2x+4y+6=0 \ \ \ |-(4y+6) \\
-2x=-4y-6 \ \ \ |\div (-2) \\
x=2y+3 \\ \\
\hbox{substitute 2y+3 for x in the 2nd equation:} \\
2y+3-5y+3=0 \\
-3y+6=0 \ \ \ |-6 \\
-3y=-6 \ \ \ |\div (-3) \\
y=2 \\ \\
x-5y+3=0 \\
x-5 \times 2+3=0 \\
x-10+3=0 \\
x-7=0 \ \ \ |+7 \\
x=7 \\ \\
(x,y)=(7,2)
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Solve for x and y: x=5−2y 6y=10−3x
Mama L [17]

we have

x=5−2y ---> multiply by 3 both sides-----> 3x=15-6y-----> 6y=15-3x----> equation 1

6y=10−3x------> equation 2


equation 1 and equation 2 has the same slope

the lines are parallel

slope m=-3/6-----> m=-1/2

so

there are no solution


the answer is the option

b. There is no solution


7 0
3 years ago
Choose the best decimal equivalent to represent 5/11
kolezko [41]

Answer:

To convert this fraction to a decimal, just divide the numerator (5) by the denominator (8): 5 ÷ 8 = 0.625. So,

5/8 = 0.625

Rounded values:

5/8 = 1 rounded to the nearest integer5/8 = 0.6 rounded to 1 decimal place5/8 = 0.63 rounded to 2 decimal places

Click to let others know, how helpful is it

Read more on Brainly.com - brainly.com/question/8678447#readmore

Step-by-step explanation:

6 0
2 years ago
Read 2 more answers
Pls help with algebra!
Serjik [45]
Part A: This data does represent a function because no value of x is repeated.
Part B: If x = 6 for the relation f(x) = 7x - 15, then f(x) will equal 27. The function f(x) = 7x - 15 will have the greater value
Part C: If f(x) is equal to 6 then x will equal 3
4 0
2 years ago
Bill is able to save $35/week after working part-time and paying his expenses. These two formulas show his weekly savings: f(1)
Umnica [9.8K]
1. We use the recursive formula to make the table of values:
f(1) = 35
f(2) = f(1) + f(2-1) = f(1) + f(1) = 35 + 35 = 70
f(3) = f(1) + f(3-1) = f(1) + f(2) = 35 + 70 = 105
f(4) = f(1) + f(4-1) = f(1) + f(3) = 35 + 105 = 140
f(5) = f(1) + f(5-1) = f(1) + f(4) = 35 + 140 = 175

2. We observe that the pattern is that for each increase of n by 1, the value of f(n) increases by 35. The explicit equation would be that f(n) = 35n. This fits with the description that Bill saves up $35 each week, thus meaning that he adds $35 to the previous week's value.

3. Therefore, the value of f(40) = 35*40 = 1400. This is easier than having to calculate each value from f(1) up to f(39) individually. The answer of 1400 means that Bill will have saved up $1400 after 40 weeks.

4. For the sequence of 5, 6, 8, 11, 15, 20, 26, 33, 41...
The first-order differences between each pair of terms is: 1, 2, 3, 4, 5, 6, 7, 8...since these differences form a linear equation, this sequence can be expressed as a quadratic equation. Since quadratics are functions (they do not have repeating values of the x-coordinate), therefore, this sequence can also be considered a function.
4 0
3 years ago
Y=–3x + 6y=9 What is the solution to the system of equations? (–21, 9) (9, –21) (–1, 9) (9, –1)
weqwewe [10]

ANSWER


The solution is (-1,9)

EXPLANATION

We want to solve the simultaneous equations


y=-3x+6---(1)


and


y=9--(2).


We substitute equation (2) in to equation (1), to obtain


9=-3x+6


This has now become a linear equation in a single variable x.


We solve for x  by grouping like terms.


9-6=-3x


3=-3x


We divide through by negative 3 to get;


-1=x.


Hence, the solution is (-1,9)





7 0
3 years ago
Read 2 more answers
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