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3 years ago

Evaluate: 3x^2 + y when x=1 and y=-3 *

Mathematics

1 answer:

Sliva [168]3 years ago

4 0

Answer:

Step-by-step explanation:

x=1 and y=-3

so 3x^2 + y = 3*1^2 + (-3)

= 3* 1 -3

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3x-y= 17<br> -x+y= -7<br><br> Help please

AlexFokin [52]

Answer:

y = -2

x = 5

Step-by-step explanation:

3x - y = 17

-x + y = -7

here we can find the sum of the two equations

2x = 10

x = 5

now we can just plug in the value of x to find y

-(5) + y = -7

y = -2

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2 years ago

4x - 2y = 5<br> y= 2x + 10

Helga [31]

Answer:

There is no solution

Step-by-step explanation:

4x - 2y = 5 --> 4x - 2(2x + 10) = 5

4x - 4x - 20 = 5

4x - 4x -25 = 0

Final answer is -25 = 0 and so therefor it is no solution

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Answer:

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Step-by-step explanation:

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