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Anna35 [415]
1 year ago
9

Which is the correct answer ?????

Mathematics
1 answer:
Damm [24]1 year ago
6 0
<h3>Answer:  True</h3>

Explanation:

Technically you could isolate any variable you wanted, from either equation. However, convention is to pick the variable in which isolating it is easiest, and most efficient.

The key thing to look for is if there's a coefficient of 1. This is found in the second equation for the y term. Think of -4x+y = -13 as -4x+1y = -13. Due to the coefficient of 1, when solving for y we won't involve messy fractions.

If you were to solve for y, then you'd get y = 4x-13, which is then plugged in (aka substituted) into the first equation. That allows you to solve for x. Once you know x, you can determine y.

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50 POINTS AND WILL MARK BRAINLIEST NEED HELP ASAP
trasher [3.6K]

Answer:

Please see attached image and all steps below for both parts

Step-by-step explanation:

Task 1

The following system of equations includes a linear equation and a quadratic one:

\left \{ {{y=x+2} \atop {y=x^2-8x+2}} \right} \}

it can be solved by using substitution in the second equation of the variable "y" by the linear expression of the first equation:

x+2=x^2-8x+2\\x=x^2-8x\\x^2-9x=0\\x\,(x-9)=0

and this product of two factors will e zero when either factor is zero, that is: when x = 0, or when x = 9 [to make zero the binomial(x - 9)]

There are two solutions: x = 0 and x = 9.

When we graph both expressions in the system, we see that the line intercepts the parabola at the points (0, 2) and (9, 11). See attached image.

Task 2

Part 1:

Let's pick 30 as a number larger than 25. 30 can be written as 40 - 10

So we can use:

(40 -10)^2=40^2-2\,(40)\,(10)+ 10^2=1600-800+100=900

to calculate its square.

Part 2:

let's choose a=9 and b=10 so we use:

9^3+10^3=(9 + 10)\,(9^2-(9)\,(10)+10^2)=(19)\,(81-(90)+100)=19\,(81-180+100)=19\,*\,91=1729

8 0
3 years ago
What is the equation in point slope form of the line that goes through the points (-4,-2) and(-6,16)
Stels [109]

Answer:

16-(-2)/ -6-(-4)= 18/-2=   -9

Step-by-step explanation:

y2-y1/ x2-x1

6 0
3 years ago
Need steps written and solved
BaLLatris [955]
U can see the answer in the picture below

4 0
2 years ago
How do i solve -3x-5=10
natulia [17]

Answer:

x= -5

Step-by-step explanation:

Add 5 to both sides

-3x -5+5 = 10 +5

-3x = 15

Divide both sides by -3.

-3x/-3= 15/-3

      x= -5

8 0
2 years ago
Leta has $45 in her account in May. How much money does she have in her account in August
wariber [46]
45-15= 30-28= 2+18=20
Is that what the question was asking??
5 0
3 years ago
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