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Masja [62]
3 years ago
10

Solve the equation 6x + 3y = 15 for y. What does y equal if x = 2? If x = 5?

Mathematics
2 answers:
horsena [70]3 years ago
4 0
6(2)+3y=15
12+3y=15
-12        -12
3y=3
3y/3  3/3
y=1

6(5)+3y=15
30+3y=15
-30        -30
3y=-15
3y/3   -15/3
y= -5
Sonja [21]3 years ago
3 0
6x + 3y = 15 (without plugin)
Now add the plugin for 2
6(2) + 3y = 15 (now solve for y)
12 + 3y = 15 (do 6 x 2)
3y = 3 (subtract 12 from each side)
y = 1 (divide each by 3)


Now the plugin for 5
6(5) + 3y = 15 (now solve for y)
30 + 3y = 15 (do 6 x 5)
3y = - 15 (subtract 30 from each side)
y = -5 (divide each side by 3)

Hope this helped! If it isn't clear just comment your question!

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Which of these are equivalent? NO LINKS. NEED HELP ASAP
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Consider the polynomial function.
svp [43]

The number of positive zeros is 1. The number of negative zeros is either 3 or 1.

<h3>Rule of Descartes</h3>

This states that the number of real positive zeros of a polynomial are equal to or less than by an even number the number of sign changes of the coefficients of the polynomial, f(x). Also, the number of real negative zeros of a polynomial are equal to or less than by an even number the number of sign changes of the coefficients of the polynomial, f(-x).

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Since f(x) = x⁴ + 2x³ - 11x² - 5x - 6

The cofficients are +1, + 2, -11, -5, -6

There is no sign change from + 1 to + 2.

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There is no sign change from -5 to - 6.

Since there is only one sign change, there is 1 positive zero.

<h3>The negative zero</h3>

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The cofficients are +1, - 2, -11, +5, -6

There is a sign change from + 1 to - 2.

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There is a sign change from - 11 to + 5.

There is a sign change from +5 to - 6.

Since there are 3 sign changes, we have 3 or 3 - 2 = 1 negative zeros.

So, the number of positive zeros is 1. The number of negative zeros is either 3 or 1.

Learn more about rule of descartes here:

brainly.com/question/11444977

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tresset_1 [31]

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Simplify 122 over 4 to 61 over 2

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