Hey guys PLEASE HELP ME SO THIS ONE IS TRICKY AND COMPLEX I APPRECIATE IF SOMEONE REACHES OUT AND HELPS. 2X+Y=-147X-4Y=-19 OK SO FAR I TOOK THE second equation and added 4y to both sides which then resulted in 7x=4y-19 did i do something wrong?
Answers
Answer 1
Answer:
You can certainly start out that way, but when you solve that equation for x, it's a little more complex than if you started with the other equation. I usually start with the most simple equation first. Let's take the first equation and solve for y... that will leave us without any fractions to deal with.
2x + y = -14
y = -14 - 2x
Now we have a y value and we can substitute it back into the other equation. So we will replace y in the second equation with (-14 - 2x).
That will leave us with just the x as a variable and we can solve for x.
7x - 4y = -19
7x - 4(-14 - 2x) = -19 multiply the -4 through the parentheses
7x + 56 + 8x = -19 combine like terms
15x + 56 = -19 subtract 56 from each side
15x = -75 divide each side by 15
x = -5
Now we have a value for x that we can substitute back into either of the original equations and then solve for y. I usually go with the easier equation, but it doesn't matter. Let's use the first one...
2x + y = -14
2(-5) + y = -14 multiply the 2 through the parentheses
-10 + y = -14 add 10 to each side
y = -4
So your ordered pair is
(-5, -4)
That is where the 2 lines are equal to one another, so that's the point where they they intersect.
Note*** You can start these problems with either equation and solving for either x or y... it doesn't matter. After you substitute the values into the other equation it will work out the same.
2x + y = -14
y = -14 - 2x
Now we have a y value and we can substitute it back into the other equation. So we will replace y in the second equation with (-14 - 2x).
That will leave us with just the x as a variable and we can solve for x.
7x - 4y = -19
7x - 4(-14 - 2x) = -19 multiply the -4 through the parentheses
7x + 56 + 8x = -19 combine like terms
15x + 56 = -19 subtract 56 from each side
15x = -75 divide each side by 15
x = -5
Now we have a value for x that we can substitute back into either of the original equations and then solve for y. I usually go with the easier equation, but it doesn't matter. Let's use the first one...
2x + y = -14
2(-5) + y = -14 multiply the 2 through the parentheses
-10 + y = -14 add 10 to each side
y = -4
So your ordered pair is
(-5, -4)
That is where the 2 lines are equal to one another, so that's the point where they they intersect.
Note*** You can start these problems with either equation and solving for either x or y... it doesn't matter. After you substitute the values into the other equation it will work out the same.
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Question in the file below. (Khan Academy)
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Together, Sarah's two cats have the same mass as her dog, 11 kg. The mass of one cat is1500 g greater than the mass of the other. What are the masses of the two cats?
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Write expression using a positive exponent1. 5⁻ ² 2. -7 ⁻¹ 3. t⁻⁶ 4. n⁻² write each expression as an expression using a negative exponent other than -1 5. 1/3⁴ 6.1/9² 7.1/49 8.1/8
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Answers
do 5x4 and her tank can hold 20 gallons
Answers
Step-by-step explanation:
The no. in the box will be =144
z²-24z+144
Answers
7 divided by 12 = 1 5/7
or
7 divided by 12 = 1.714
or
7 divided by 12 = 1.714
0.58333333(ect.)
The 3 keeps repeating so when writing i, you should have a repeating bar over sed three
The 3 keeps repeating so when writing i, you should have a repeating bar over sed three
Answers
Simplify by 13 and will result 1/6
Okay, So We Know That 13 Is A Prime Number.
So, The Only Thing We Can Do Is Look At The Multiples Of 78.
1*78
2*39
3*26
6*13
13*6
26*3
78*1.
So, We Can Divide 78 By 13.
To Simplify, Do:
÷ 
So, The Answer Is
So, The Only Thing We Can Do Is Look At The Multiples Of 78.
1*78
2*39
3*26
6*13
13*6
26*3
78*1.
So, We Can Divide 78 By 13.
To Simplify, Do:
So, The Answer Is
Answers
I can help you! But first, could you please give me the full question?
Answers
10 / 4 - 6.2
2.5 - 6.2
= -3.7 ~~~
2.5 - 6.2
= -3.7 ~~~
10 ÷ 4 = 2.5 - 6.2 = -3.7
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