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soldier1979 [14.2K]

2 years ago

5

What it the x and y intercept of y=2x^2+3x+1

1 answer:

babunello [35]2 years ago

5 0

x = -1

y = 1

To find this, input the equation into a graphing calculator, whether online or an actual one, and you have two options:

1 - Search for the points in which the line crosses the x and or y axis.

2 - Hit 2nd Graph to access the table and find when x and y equal zero.

Hope this helps!

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Solve the system. x – 4y – z = 21 6x – 3y – z = –4 –x +2y –5z = 19 Answer: x = , y = , z =

FrozenT [24]

Consider the given equations:

$-x+2y-5z = 19$ (Equation 1)

$6x-3y-z= -4$ (Equation 2)

$x-4y-z=21$ (Equation 3)

Adding equations 1 and 3, we get

$-x+2y-5z+x-4y-z = 19+21$

$-2y-6z = 40$

So, we get $-y -3z = 20$ (Equation 4)

Multiplying equation 3 by '6', we get

$6x - 24y-6z = 126$ (Equation 5)

Subtracting equation 5 from equation 2, we get

$(6x-3y-z)-(6x - 24y-6z) = -4-126$

$6x-3y-z-6x + 24y+6z) = -4-126$

$21y+5z = -130$ (Equation 6)

Multiplying equation 4 by '21' and adding it to equation 6, we get

$-21y-63z+21y+5z = 420-130$

$-58z = 290$

So, z = -5

Since, $-y-3z = 20$ $-y+15=20$ $y=-5$

So, y=-5

Now, $x-4y-z=21$ $x-4(-5)-(-5)=21$ $x+20+5=21$ $x+25=21$ $x= -4$

So, x = -4

Therefore, x = -4, y= -5 and z= -5 are the solutions to the given equations.

7 0

3 years ago

3. pH is given by the formula pH = -log [A]

ale4655 [162]

Well, what I’d do is just see who has the most which is Bill and then for the other question I’d just subtract 7.8 - 7.2 which is equal 6 so the pH is greater by .6

5 0

3 years ago

How do you write 4.40 × 10^3 in standard form?

Sindrei [870]

Answer:

4400 is the answer

Step-by-step explanation: You move the decimal point to the right 3 spaces. If it was 10^-3 you would move the decimal point to the left 3 spaces.

8 0

3 years ago

Simplify the expression <br><br> 2(5x-1)

MrRissso [65]

The answer is 8x I believe

4 0

3 years ago

Read 2 more answers

I really need help with this, and also if it's Substitution or linear combination and it will be really helpful if you do step b

Delicious77 [7]

Answer:

-2x+y=12

Step-by-step explanation:

linear equation

5 0

2 years ago