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RUDIKE [14]
3 years ago
5

Find the solutions of the system y = –2x – 1 and y = 3–x–1. What are the x-coordinates of the solutions? Choose all that apply.

1 0 -1 -2
Mathematics
2 answers:
Wittaler [7]3 years ago
5 0
Hello : 
<span>y = –2x – 1....(1)
 y = 3x–1.....(2)
by (1) and (2) :  3x-1 = -2x-1
5x =0
x =0 ....(</span><span>the x-coordinates of the solutions)</span>
grandymaker [24]3 years ago
5 0

Answer:

The x coordinate of the solution is 0

Step-by-step explanation:

y = –2x – 1 and y = 3x–1

Solve for x using substitution method

Replace y with -2x-1 in second equation

-2x-1 = 3x-1

Add 2x from both sides

-1= 5x - 1

add 1 on both sides

0=5x

Divide by 5 from both sides

x=0

The x coordinate of the solution is 0

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Determine if direct variation x-2y=0
Fofino [41]

Answer:

x-2y=0 is a direct variation

Step-by-step explanation:

Direct variation is of the form

y= kx

Can we get the equation in that form

x-2y =0

Add 2y to each side

x-2y+2y =0_2y

x=2y

Divide each side by 2

x/2 = 2y/2

1/2x =y

Flip the sides

y = 1/2x

This is of the form y= kx where k = 1/2

x-2y=0 is a direct variation

3 0
3 years ago
Can someone please help with this and explain how you the answer, I'll mark you as brainliest
ki77a [65]

Answer:

7?

Step-by-step explanation:

I think...

4 0
3 years ago
Subtract the fractions and simplify the answer 9-51/3<br> Can you show me
Shalnov [3]
When adding or subtracting fractions the denominators must be the same convert 9 to 27/3 27/3-51/3= - 22/3 or - 7 1/3 nope this helps
4 0
3 years ago
Your supposed to find the angle of the triangle but I know the answer 145 but I want to know how you get the answer
Inga [223]
A straight line adds up to 180
So the line opposite of 137 should add up to 180
This gives us the equation 137+x=180 then x=43

The triangle also adds up to 180 degrees
So 102+43+x=180
The equation can be simplified to 145+x=180 therefore x=35


So x+?=180  because it is a straight line.
We can substitute x in making the equation 35+?=180
Now we want to solve for the ? so we'll subtract 35 from each side 
This leaves us with the equation ?=145

So we now know that the ?=145

4 0
3 years ago
Here is an easy puzzle:
galina1969 [7]
The answer is 
date
1                  2                 3          4             5                                         31
r1                r2               r3           r4          r5               .  .  .                  r31
1gm           2gms         3<span>gms     4gms    5gms        .   .  .                 31gms

r1+r2+ .... +r31= 31(31+1) /2=496gms  (31 rings)

he only made 5 rings

31 rings----------> 496 gms
5 rings ------------> ? = 5 x496  / 31=80 gms

</span><span> the weights of those 5 rings was 80 gms</span>
4 0
3 years ago
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