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Shkiper50 [21]
4 years ago
8

Y=3x+7 solve this system of equation using any method

Mathematics
1 answer:
love history [14]4 years ago
3 0

Answer:

x=2, y=13

Step-by-step explanation:

In order to get this by addition which is the easiest way for this you want to take both equations

y=3x+7 and y=-4x+21 and move x to the other side of the equation so it is like  4x+y=21 and -3x+y=7 like that now you have to get rid of one of the exponents and the easiest one to get rid of is y so I'm going to multiply -3x+y=7 by negative 1 so it becomes 3x-y=-7 that way the equations value has not changed since I multiplied both sides and now when I add

4x+y=21 and 3x-y=-7 It'll look like

4x+y=21

3x-y=-7          add those It will get rid of the y

then get 7x=14 simplify to get x=2 then you can take -3x+y=7 plug in x and get

-3(2)+y=7 multiply into -6+y=7 then simplify you get y=13

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jill's fish weighs 8 times as much as her parakeet. together, the pets weigh 63 ounce. how much does the fish weigh?
andriy [413]
<span><span>1.       </span>Jill’s fish weighs 8 times as much as her parakeet.
Together they weigh 63 ounce.
Find the weight of the fish.
=> Jill’s Fish = 8x
=> Parakeet = x
Equation:
=> 8x + x = 63
=> 9x = 63
=> 9x / 9 = 63 / 9
=> 7 ounce
Thus the weight of fish = 8(7)
=> 56 ounce
Which is 8 times as much as parakeet which is 7
=> 56 + 7 = 63 ounce</span>



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4 years ago
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4 0
3 years ago
Melissa has $100 in the bank. She plans to deposit $40 per week until she reaches $500. What is the rate of change? Explain what
Wewaii [24]

Answer:

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Step-by-step explanation:

Step one:

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3 years ago
The sum of three consecutive odd integers is 255 find the integers
Sunny_sXe [5.5K]
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8 0
3 years ago
Hi, I'm struggling on level 2 for
andrew11 [14]

Answer:

Step-by-step explanation:

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6 0
2 years ago
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