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2 years ago

You haft too use elimination to solve this thank you

Mathematics

1 answer:

lakkis [162]2 years ago

5 0

Answer:

x=0, y=-2

Step-by-step explanation:

Because 9y appears twice in both equations, you can subtract the equations to eliminate the y variable so you can solve for x:

-7x + 9y = -18

-(4x + 9y = -18)

__________

-11x = 0

x = 0

Since we know x=0, then we plug it back into one of the equations to get the value of y:

-7x + 9y = -18

-7(0) + 9y = -18

0 + 9y = -18

9y = -18

y = -2

Therefore, x=0, and y=-2

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Rewrite the quadratic function in vertex form.<br> Y=2x^2+4x-1

Fantom [35]

Answer:

$\large\boxed{y=2(x+1)^2-3}$

Step-by-step explanation:

The vertex form of an equation of a parabola:

$y=a(x-h)^2+k$

(h, k) - vertex

We have

$y=2x^2+4x-1=2\left(x^2+2x-\dfrac{1}{2}\right)$

We must use the formula: $(a+b)^2=a^2+2ab+b^2\qquad(*)$

$2\left(x^2+2(x)(1)-\dfrac{1}{2}\right)=2\bigg(\underbrace{x^2+2(x)(1)+1^2}_{(*)}-1^2-\dfrac{1}{2}\bigg)\\\\=2\left((x+1)^2-1-\dfrac{1}{2}\right)=2\left((x+1)^2-\dfrac{3}{2}\right)$

Use the distributive formula a(b + c) = ab + ac

$2(x+1)^2+2\left(-\dfrac{3}{2}\right)=2(x+1)^2-3$

5 0

2 years ago

Could you check if mine is right? If not please slove

maksim [4K]

Answer:

no, it’s not correct

Step-by-step explanation:

I just know, it would be the second one

6 0

2 years ago

What is the LCM of 24 and 90?

madam [21]

24,48,72,96,120,144,168,192,216,240,264...360

90,180,270,360

LCM of 24 and 90 is 360

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hope it helps

3 0

2 years ago

Read 2 more answers

LOOK AT THE PICTURE BELOW PLEASE!

Brrunno [24]

Answer:

Step-by-step explanation:

Each question is 6%/3 = 2% worth. If each question is worth 2% then total questions must be 50 (cuz that would be 2% x 50 (total question) = 100%).

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1 year ago

How is dividing 140 by 20 the same as dividing 1,400 by 200?

Goryan [66]

It's the same only adding a zero at the end

6 0

2 years ago