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n200080 [17]
2 years ago
14

Find the solution: 3x + 2y = 12 -2x + 3y = 5

Mathematics
1 answer:
finlep [7]2 years ago
7 0

Answer:

x = 3

y = 2

Step-by-step explanation:

3x + 2y = 12

-2x + 3y = 5 to find the solution we will use elimination method and for that, multiply second equation with 3 and the first equation with 2

<em>2 * 3x + 2y = 12</em>

<em>6x + 4y = 24</em>

<u>3 * -2x + 3y = 5</u>

<u>-6x + 9y = 15</u>  now find the sum of both equation:

<em>6x + 4y  </em><u>-6x + 9y</u> = 24 + 15 add like terms

13y = 39 divide both sides by 13

y = 3 now that we found the value of y we can use this to calculate the value of x

3x + 2y = 12 replace y with 3

3x + 2*2 = 12

3x + 4 = 12 subtract 4 from both sides

3x = 9 divide both sides by 3

x = 3

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The long, straightforward, brute-force way to slog through the problem:

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Number of little cubes that fit into the prism =  (648 cm³) / (3.375 cm³) = <em>

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The elegant but almost equally long way to master the problem:

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If each dimension of your measuring cubie is 1.5cm,
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Its volume is  (8 x 4 x 6) = <em>192 measuring cubies</em>.


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