Substitute 3x+y=4 5x-y=22

1 answer:

4 0

Simultaneous Equations

3x + y = 4
5x - y = 22
The signs of the matching values aren't the same so we add the rest of the equations.
8x = 26
Divide both sides by 8 to get x = 3.25
Now substitute back into the first equation.
(3 x 3.25) + y = 4
9.75 + y = 4
Subtract 9.75 from both sides
y = -5.75

You might be interested in

What is the scale factor? ( the answer must be a fraction).

MrRissso [65]

Since these are similar triangles you can use any two corresponding sides to figure out the scale factor.

Use the bottom side. Going from the first triangle to the second the scale factor is:
15/9 = 5/3

8 0

3 years ago

Plss help me with my question

Tamiku [17]

Answer:

1. 45.76, 52.17, 54.2, 55.16, 56.78

2. 9.18, 9.2, 9.98, 10.54, 11.23

3. 0.01, 0.05, 0.067, 0.07, 0.09

4. 33.14, 33.15, 33.45, 33.52, 33.55

5. 3.45, 4.45, 4.9, 5.49, 6.5

6 0

3 years ago

The probability that a fair coun tossed 10 times will lsndheads up on all ten tosses is 1 out of ?

boyakko [2]

It is one out of ten

4 0

3 years ago

Solve using square roots 3x^2+25=73

seropon [69]

Heya !

Given expression -

$3 {x}^{2} + 25 = 73$

Subtracting 25 both sides ,

$3 {x}^{2} + 25 - 25 = 73 - 25 \\ \\ 3 {x}^{2} = 48$

Dividing by 3 on both sides ,

$\frac{3 {x}^{2} }{3} = \frac{48}{3} \\ \\ {x}^{2} = 16$

Therefore ,
$x = + \: 4 \: \: \: \: or \: \: - 4 \: \: \: \: \: \: \: Ans.$

4 0

4 years ago

Logify the problem 5x+2+3=25

77julia77 [94]

the answer is x=4.

5 0

3 years ago