3 years ago

Let f(x) = 4x -7 and g(x) = -7x + 4 Find f (-3) + g(4)

Mathematics

1 answer:

Doss [256]3 years ago

8 0

Answer:

-43

Step-by-step explanation:

f(-3) = 4(-3) - 7 = -12 - 7 = -19

g(4) = -7(4) + 4 = -28 + 4 = -24

-19 + (-24) = -43

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What are the solutions to the following system?<br> -2 x² + y = -5<br> y=-3x²+5

Arturiano [62]

Answer:

$x=\pm\sqrt{2}$

Step-by-step explanation:

This system of equations is convenient, because the second equation already expresses y in terms of x. Now, you can substitute that in.

$-2x^2-3x^2+5=-5$

Multiplying both sides by -1 and bringing the 5 over:

$2x^2+3x^2-10=0$

Combining like terms and factoring out 5:

$5(x^2-2)=0$

Factoring:

$5(x-\sqrt{2})(x+\sqrt{2})=0$

Solutions: $x=\pm\sqrt{2}$

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Step-by-step explanation:

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3 years ago

Which ordered pair is the best estimate for the solution of the system of equations? y=−1/2x+4y=1/2x−3

tamaranim1 [39]

If we add the 2 equations the terms in x dssappear and we get

2y = 1
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answer is (7, 1/2)

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