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user100 [1]
4 years ago
6

5x+6y=13;-5x+2y=11. how do I solve this

Mathematics
1 answer:
Wittaler [7]4 years ago
8 0
You solve for X in one equation and plug it into the other. So... 

<span>5x+6Y=13 </span>
<span>5x=13-6Y </span>
<span>x=(13-6Y)/5 </span>

<span>Then, you replace X in the other equation... </span>

<span>-5x+2y=11 </span>
<span>-5[(13-6y)/5]+2y=11 </span>
<span>-13+6y+2y=11 </span>
<span>8y=11+13 </span>
<span>8y=24 </span>
<span>y=3 </span>

<span>Now that you have Y, you just solve for x using either equations... </span>

<span>5x+6(3)=13 </span>
<span>5x=13-18 </span>
<span>5x=-5 </span>
<span>x=-1 </span>

<span>Therefore, X = -1 & Y = 3

</span>
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Step-by-step explanation:

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How do i find x in this problem
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Your test scores in one class are 79 and 85. What possible scores can you earn on your next test to have a test average between
mestny [16]

Multiply the average by the number of tests to find the total of the scores:

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88 x 3 = 264

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3 years ago
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How do I do this? Please explain it. Thank you.
Westkost [7]

Answer:

slope = - \frac{14}{3}

Step-by-step explanation:

the slope of the secant line in the closed interval [a, b ] is

slope = \frac{f(b)-f(a)}{b-a}

here [a, b ] = [1, 4 ]

f(b) = f(4) = - 2^{4} + 5 = - 16 + 5 = - 11

f(a) = f(1) = - 2^{1} + 5 = - 2 + 5 = 3

slope = \frac{-11-3}{4-1} = \frac{-14}{3} = - \frac{14}{3}


8 0
3 years ago
B<br> 6x+7<br> 3x+c<br> 2x-1<br><br> What is the value of c in degrees
andreev551 [17]

Answer:

1.x=15

2.<A=29

Step-by-step explanation:

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11x=180-15

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3 0
3 years ago
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