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SSSSS [86.1K]
2 years ago
6

Solve by the elimination method. Check your work.

Mathematics
2 answers:
sweet-ann [11.9K]2 years ago
6 0

Answer:

1: x = 19 y = 16 ; 2. x = 5 y = -4

Step-by-step explanation:

To check your work plug the numbers back into one of the equations and see if it's true.

For example:
10(19)-9(16)=46

46=46

1. I distributed 3 to all the numbers so that 9y and -9y would cancel then you add like terms.

2. I distributed -4 to all the numbers so that 4x and -4x would cancel. Then add all like terms.

Once you get x or y plug it back into one problem to get the other variable.

Hope this helps!

kozerog [31]2 years ago
5 0

#1

  • 10x-9y=46--(1)
  • -2x+3y=10--(2)

(2)×3

\\ \tt\hookrightarrow -6x+9y=30--(3)

Subtracting eq(1) from (3)

\\ \tt\hookrightarrow -16x=-16

\\ \tt\hookrightarrow x=1

Put in eq(2)

\\ \tt\hookrightarrow -2+3y=10

\\ \tt\hookrightarrow y=4

#2

  • 4x+3y=8--(1)
  • x-2y=13--(2)

(2) ×4

\\ \tt\hookrightarrow 4x-8y=52--(3

Subtracting eq(1) from (3)

\\ \tt\hookrightarrow -11y=44

\\ \tt\hookrightarrow y=-4

Put in eq(2)

\\ \tt\hookrightarrow x+8=13

\\ \tt\hookrightarrow x=5

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Step-by-step explanation:

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The total area of these 444 triangles is 4 \cdot 6 = \greenD{24}4⋅6=244, dot, 6, equals, start color #1fab54, 24, end color #1fab54.

Hint #33 / 4

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\begin{aligned} \text{Surface area} &= \blueD{9}+ \greenD{24}\\\\ &= 33\\\\ \end{aligned}

Surface area

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​

Hint #44 / 4

The surface area of this square pyramid is 333333 units^2

2

squared.

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