2 years ago

Solve the system of equations by graphing. x+y=-7, 2x+y=6

Mathematics

2 answers:

kiruha [24]2 years ago

8 0

Step-by-step explanation:

I hope this is right, I used demos

masya89 [10]2 years ago

3 0

Answer: x=-1 Y = 8

Step-by-step explanation:

you can change it to y = -x-7, y=-2x+6

Then because the both equal “y” they must equal each other.

So -x+7 = - 2x+6

Then solve

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Step-by-step explanation:

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Answer:

Step-by-step explanation:

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2 years ago

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3 years ago

f(x) = -4x^2+12x-9f(x)=−4x 2 +12x−9f, left parenthesis, x, right parenthesis, equals, minus, 4, x, squared, plus, 12, x, minus,

Olin [163]

Answer:

The graph has only one x-intercept

Step-by-step explanation:

we have

$f(x)=-4x^2+12x-9$

we know that

The discriminant of a quadratic equation of the form

$ax^{2} +bx+c=0$

is equal to

$D=b^{2}-4ac$

in this problem we have

$f(x)=-4x^2+12x-9$

$a=-4\\b=12\\c=-9$

substitute

$D=12^{2}-4(-4)(-9)$

$D=144-144$

$D=0$

The discriminant is zero

That means ----> The quadratic equation has one real solution

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2 years ago

An arrow is shot vertically upward from a platform 45 feet high at a rate of 168 ft/sec. Use the quadratic function

Maksim231197 [3]

Answer:

5.3 s

Step-by-step explanation:

a) since the height is defined by a function, we can find the turning point of the quadratic , which is where the ball will have the highest point. The turning point is where the gradient is equal to zero so we differentiate first

$h(t) = -16t^{2} + 168t + 45\\h'(t)= -32t+168\\0=-32t+168\\t=5.3s$

8 0

2 years ago

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