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Marta_Voda [28]
3 years ago
12

I have to do systems by substitution practice ex -2x + y =-16 -8x - 7y = -20

Mathematics
2 answers:
Nady [450]3 years ago
8 0

-2x+y=-16

-8x-7y=-20

Solve -2x+y=-16 for y

Add 2x  to both sides

-2x+y+2x=-16+2x

y=2x-16

Substitute 2x-16 for y in -8x-7y=-20

-8x-7y=-20

Simplify both sides of the equation

-8x-7(2x-16)=-20

Add -112 to both sides

-22x+112+-112=-20+-112

-22x=-132

Divide both sides by -22

-22x/-22=-132/-22

x=6

Substitute 6 for x in y=2x-16

y=2x-16

y=(2)(6)-16

Simplify both sides of the equation

y=-4

Answer :

y=-4 and x=6


I hope that's help !

-22x+112+


babymother [125]3 years ago
7 0
This one's a little bit harder but i'm sure i can solve it. I usually pick the smaller number to solve first and then substitute the larger one.
-2x+y=-16
-8x-7y=-20

So you'll solve

-2x+y=-16
+2x/     +2x
y=2x-16------- this is what y means so you substitute y in the other equation for this answer.

-8x-7y=-20
-8x-7(2x-16)=-16------------------------Use distributive property to simplify.
-8x-14x+112=-16
-22x+112=-16
       -112    -112
-22x=-128---------------Divide -22 on both sides
x=5.82

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Alona [7]

The speed of current will be "4.5 mph" and the rate Pratap can row in still water will be "8.5 mph".

What does "speed" mean in mathematics?

  • Speed is what it means. the speed of a change in an object's location in any direction.
  • Speed is defined as the ratio of distance to the amount of time it took to cover that distance.
  • Speed is a scalar quantity because it just has a direction and no magnitude.

Given:

Distance "26 miles" in time "2 hours".

Let,

Speed of water = y

Pratap speed when rowing in still water = x

As we know,

      Speed = distance/time

then,

  x + y = 26/2

  x + y = 13

 x = 13 - y

In return trip took him time "6.5 hours",

       x - y = 26/6.5

      x - y = 4

By substituting the value of "x", we get

 13 - y - y = 4

  13 - 2y = 4

     2y = 13 - 4

        2y = 9

          y = 9/4 = 4.5 mph (Rate of the current)

By substituting the value of "y", we get

    x = 13 - a

   x = 13 - 4. 5 = 8.5 mph (Pratap can row in still water)

Learn more about speed

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Show that a sequence {sn} coverages to a limit L if and only if the sequence {sn-L} coverages to zero.
Andreyy89

Let {s_n}_{n\in\Bbb N} be a sequence that converges to L. This means for any \varepsilon>0, there is some N such that |s_n-L| for all n>N. From this inequality we see that |(s_n-L)-0|, so it follows that s_n-L\to0.

On the other hand, let {s_n-L} be a sequence that converges to 0. This means |(s_n-L)-0| for all large enough n, and we get the simpler inequality for free, |s_n-L|, so it follows that s_n\to L.

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I can try to do my best

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likoan [24]

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