What is the value of a in this linear system?

7x-3y=4 2x-y=1 the solution to the system of equations is

Alex_Xolod [135]

Answer:

x = 1 and y = 1

Step-by-step explanation:

7(1) minus 3(1) = 4

and 2(1) minus 1 = 1

just try and guess a number and try to solve the problem with that number, if it isn't the answer then repeat.

4 0

3 years ago

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Which country was Australia once a colony of?

Tema [17]

Austria was once a colony of Belgium

3 0

3 years ago

What is the equation of the line

konstantin123 [22]

Hello there!

The answer is B. $\frac{2}{7}$
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Explanation and Work:

We first must identify if the line goes through the origin or not.

The origin is (0, 0)

The line does go through the origin. This means that there is no y-intercept

The specific equation we would you use would be:

y = kx

K is the constant

We find this by finding the slope.

Slope is found by:

$\frac{y2 - y1}{x2 - x1}$

y2 = 2

y1 = 0

x2 = 7

x1 = 0

Now, let's plug in these numbers.

$\frac{2-0}{7-0} = \frac{2}{7}$

So, now let's plug he slope into our formula.

y = $\frac{2}{7} x$

So, our answer would be B.

I hope I helped!

Let me know if you need anything else!

~ Zoe

8 0

3 years ago

Pleasee help x.x 1. Solve the system by elimination-

patriot [66]

Q1. The answer is x = 1, y = 1, z = 0

(i) -2x+2y+3z=0
(ii) -2x-y+z=-3
(iii) 2x+3y+3z=5
_________
Sum up the first and the third equation:
(i) -2x+2y+3z=0
(iii) 2x+3y+3z=5
_________
5y + 6z = 5

Sum up the second and the third equation:
(ii) -2x-y+z=-3
(iii) 2x+3y+3z=5
_________
2y + 4z = 2

(iv) 5y + 6z = 5
(v) 2y + 4z = 2
________
Divide the fifth equation by 2
(iv) 5y + 6z = 5
(v) y + 2z = 1
________
Multiple the second equation by -3 and sum the equation
(iv) 5y + 6z = 5
(v) -3y - 6z = -3
________
2y = 2
y = 2/2 = 1

y + 2z = 1
1 + 2z = 1
2z = 1 - 1
2z = 0
z = 0

-2x-y+z=-3
-2x - 1 + 0 = -3
-2x = -3 + 1
-2x = -2
x = -2/-2 = 1

Q2. The answer is x = -37, y = -84, z = -35

(i) x-y-z=-8
(ii) -4x+4y+5z=7
(iii) 2x+2z=4
______
Divide the third equation by 2 and rewrite z in the term of x:
(iii) x+z=2
z = 2 - x
______
Substitute z from the third equation and express y in the term of x:
x-y-(2-x)=-8
x - y - 2 + x = 8
2x - y = 10
y = 2x - 10
______
Substitute z from the third equation and y from the first equation into the second equation:
-4x + 4y + 5z = 7
-4x + 4(2x - 10) + 5(2 - x) = 7
-4x + 8x - 40 + 10 - 5x = 7
-x -30 = 7
-x = 30 + 7
x = -37
y = 2x - 10 = 2*(-37) - 10 = -74 - 10 = -84
z = 2 - x = 2 - 37 = -35

8 0

3 years ago

QUICKLY HELP ME PLSSSSS

joja [24]

Answer:

479

Step-by-step explanation:

342=2 portions

171=1 portion

2+5=7 portions in total

171 times 7=479

hope this helps

please can i get brainliest

7 0

2 years ago

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