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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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irina1246 [14]
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3 years ago
I do not understand how to work out this question please help
enot [183]

a) To find the missing side length on triangle A, we can use the Pythagorean theorem.

a^2 + 12^2 = 13^2

a^2 + 144 = 169

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b) The two triangles are congruent because they have two side lengths in common. If at least two side lengths are the same on two triangles, then they are congruent. In addition, these triangles have one angle in common as well.

Hope this helps!! :)

8 0
3 years ago
Plz help ASAP I will add branliest to the first answer, I need to solve for the letter
harkovskaia [24]

Answer:

6. r=2

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Step-by-step explanation:

6. 4r-3=5

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8. 5x-6=9

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6 0
3 years ago
Read 2 more answers
Suppose the function P (t) gives the pulse rate of a gymnast at various points in time during 10 sessions. Select an appropriate
ziro4ka [17]

Answer:

C

Step-by-step explanation:

When we talk of domain, we are referring to the values we have on the x axis

By considering the range of values we have on the x-axis, we have the domain we want

We have the gymnast complete the sessions in 95 seconds.

This means that the highest point on the x-axis is 95 seconds

But how do we measure time? we do this in form of integers

So the correct domain will be all

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3 0
3 years ago
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mash [69]

Answer:

D is the right answer for this question

6 0
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