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geniusboy [140]
3 years ago
9

Solve by using substitution: y = 2x - 5 and y = 5x + 7 *

Mathematics
1 answer:
faltersainse [42]3 years ago
4 0

Answer:

x = -4, y = -13

Step-by-step explanation:

2x - 5 = 5x + 7

3x = -12

x = -4

Y = 2(-4)-5 = -13

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In two or more complete sentences, give the solution and explain how you solved the system.
Triss [41]
The system is:

i) y=-2x+3
ii) y=-2\cdot3^x.

Making y's equal, we have:

                      -2x+3=-2\cdot3^x.

Dividing all terms by -2, we have:

                      \displaystyle{ x- \frac{3}{2} =3^x.

Note that y=x- \frac{3}{2} is an increasing linear function. (Its graph is the same as y=x, only shifted 3/2 units down.)

The graph of this function is below the x-axis up to 3/2, where it cuts the x-axis, and then increases above the x-axis making an angle of 45° with the x-axis.

The graph of y=3^x is completely above the x-axis, and it rises much faster than the line. We could compare at 3/2, for example, where the linear function is 0. The exponential function takes the value 3^{\frac{3}{2}}\approx5.2 and is increasing very fast.


Thus, the graphs never meet, which means the system has no solution.


Answer: no solution.
3 0
3 years ago
(-11/21)+9/21 Pls help
Ilya [14]
<h2>Answer: good question  Step-by-step explanation:Interesting  Would you like to become my friend Answer is -2/21  </h2>
4 0
3 years ago
Read 2 more answers
If line uw bisects angle tuv,, m angle tue = (13x-5) and angle wuv = (7x+31) find the value of x
scZoUnD [109]

The value of x will be 6

<u><em>Explanation</em></u>

According to the below diagram, UW is the angle bisector of ∠TUV

<u>That means,</u>  \angle TUW = \angle WUV

Given that,  \angle TUW = 13x-5 and \angle WUV= 7x+31

So, the equation will be......

13x-5=7x+31\\ \\ 13x-7x=31+5\\ \\ 6x=36\\ \\ x=\frac{36}{6}=6

So, the value of x will be 6.

4 0
3 years ago
How many packages of pencils should Phillip buy?
AfilCa [17]
C.........................
3 0
3 years ago
Chaney deposits $1435.73 into a savings account that pays a simple annual interest rate of 1.32%. How much interest will she ear
Aneli [31]

Answer:

Interest Chaney earns after 3 years is  $56.85

Step-by-step explanation:

Given:

Amount deposited = $1435.73

Simple annual interest rate = 1.32% = 1.32/ 100 = 0.0132

To find: Interest after 3 years

We know that the formula to calculate the interest amount is

Simple interest (S.I.) = \frac{Prt}{100}

where,

P is the initial amount deposited

r is the rate of simple interest in percentage

t is the time in years for which interest is to be calculated

Substituting the known values in the formula, we get

S.I = \frac{1435.73 x 1.32 x 3}{100}

    = 56.85

Hence the interest Chaney earns after 3 years is  $56.85

8 0
3 years ago
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