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3 years ago

What should be the first step in adding these equations to eliminate y?

Mathematics

2 answers:

fgiga [73]3 years ago

6 0

Answer:

Step-by-step explanation:

Since you want to eliminate <em>y</em>, the y value on the bottom equation has the be the opposite of the y value on the top one. So it's 4y on the top one, so the bottom one has to be -4y to eliminate y. The bottom one is -2y, so -2 times 2 =-4, so multiply the bottom one by 2 omg i miss linear combination

ElenaW [278]3 years ago

5 0

Answer:

Step-by-step explanation:

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Factor the quadratic equation below to reveal the solutions. X^2+4x-21=-9

a_sh-v [17]

Answer:

x = 3 and x = -7

Step-by-step explanation:

The given quadratic equation is $x^2+4x-21=0$ . We need to find the solution of this equation.

If the equation is in the form of $ax^2+bx+c=0$ , then its solutions are given by :

$x=\dfrac{-b\pm \sqrt{b^2-4ac} }{2a}$

Here, a = 1, b = 4 and c = -21

Plugging all the values in the value of x, such that :

$x=\dfrac{-b+ \sqrt{b^2-4ac} }{2a},\dfrac{-b- \sqrt{b^2-4ac} }{2a}\\\\x=\dfrac{-4+ \sqrt{(4)^2-4\times 1\times (-21)} }{2(1)},\dfrac{-4- \sqrt{(4)^2-4\times 1\times (-21)} }{2(1)}\\\\x=3, -7$

So, the solutions of the quadratic equation are 3 and -7.

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3 years ago

Nickel uses 5 ounces of mushrooms 2 ounces of butter and 1/4 pint of cream to make mushroom soup find the ratio of the number of

Zigmanuir [339]

1/4 of a pint is 4 oz. so the ratio ofmushrooms to butter to cream would be 5:2:4.

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3 years ago

A shorter style of cup is stacked tall. The graph displays the height of the stack in centimeters for different numbers of cups.

Strike441 [17]

Answer:

0.5

Step-by-step explanation:

We are looking for how much height is gained per cup added.

Height per cup added can be calculated by finding the slope of the line that runs through the two given points on the graph, (3, 5.5) and (8, 8).

Formula for slope =

Let,

3 0

3 years ago

Read 2 more answers

Ten less than 3 times a number is the same as the number plus 4 as an equation

OverLord2011 [107]

3x-10=x+4 is the equation...

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3 years ago

Please help:<br> In Δ ABC, sin A= 77, sin C= 23, and c =16, find the length of A.

Dafna1 [17]

Answer:

39.9

Step-by-step explanation:

a/sinA = c/sinC

a/sin(77) = 16/sin(23)

a = sin(77) × 16/sin(23)

a = 39.89935764

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3 years ago