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3 years ago

Use the linear combination method to solve the system of equations. Explain each step of your solution.

Mathematics

1 answer:

koban [17]3 years ago

5 0

Answer:

x=9 y=5

Step-by-step explanation:

Let -4x+9y=9 be function 1 while x-3y=-6 be function 2

function 1 plus 4 times function 2

-4x+4x+9y-12y=-15

Simplify

-3y=-15

Divide each side by -3

y=5

Substitude y=5 into function 2

x-3(5)=-6

x-15=-6

add 15 to each side

x=9

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4 years ago

Identify the number as a regional or irrational.explain. 291.87

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Answer:

291.87 is a rational number.

Step-by-step explanation:

Rational numbers are those numbers that can be expressed in fractions that is can be written as $\frac{p}{q}$ where p and q are integers and $q\neq 0$ .

Consider the given number 291.87

Rewrite the decimal number as a fraction with 1 in the denominator, we get,

$291.87=\frac{291.87}{1}$

Multiply to remove 2 decimal places. Here, you multiply top and bottom by 10² = 100

$\frac{291.87}{1}=\frac{29187}{100}$

Thus, the above fraction can be written as,

$\frac{29187}{100}=291\frac{87}{100}$

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3 years ago