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Free_Kalibri [48]
3 years ago
15

How do you decide which variable to isolate in order to use the substitution method to solve a system of linear equation?​

Mathematics
1 answer:
Kazeer [188]3 years ago
5 0
It doesn’t really matter which variable you isolate first but usually you would use the one that’s by itself already. like for example one of the equations was y = 8. you would already have your y solve for so you would just have to plug that in for y in the other equation. personally, i usually do x first unless one of the equations has either x or y by itself already. i think its easier to just do x first and then solve for y after that, but it just depends on what the equations are; sometimes it might be easier to just do y first. hope this helps!
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Find the area of the triangle <br>answer in digital format only ​
IceJOKER [234]

Answer:

33

Step-by-step explanation:

Assume that each cell on the grid represents one unit. One can use the formula, (A=\frac{(base)(hieght)}{2}) to find the area of the triangle. One can see that the base of the triangle is, (11), and the height is (6). Substitute in the given values and solve for the area,

A=\frac{(11)*(6)}{2}

A=\frac{66}{2}

A=33

3 0
3 years ago
Let C(x) be the cost to produce x batches of​ widgets, and let R(x) be the revenue in thousands of dollars. R(x) = − x² + 6x​, C
Musya8 [376]

Answer:

Step-by-step explanation:

Let C(x) be the cost to produce x batches of​ widgets, and let R(x) be the revenue in thousands of dollars.

R(x) = -x^2 + 6x,\\ C(x) = x + 4.

Profit function = Revenue  - cost

So we get profit function by subtracting C(x) from R(x) using algebraic method of subtraction.

Profit function of x

= Pr(x) = R(x) -C(x)\\= -x^2+6x-x-4\\=-x^2+5x-4

7 0
3 years ago
Justin travels at 70 km/h on his motorcycle. If the speed limit is 50 mi./hr., is he speeding? Why or why not?
balu736 [363]

Answer:

Justin is <em>not </em>speeding because there is 1.609 km in a mile. So if you compare it to 70 km/h to 50 mi/h it would 70 km and 43.50 miles per hour. So like I said, no he is not because he is going below 50 mi/h.

6 0
3 years ago
Read 2 more answers
Melanie is 2 years older than twice her brother Bill’s age. If Bill is 5 years old,how old is Melanie
arlik [135]

she would be 12 because

10 * 2 = 10

10 + 2 = 12

hope this helps :)

8 0
3 years ago
Read 2 more answers
I need help with point slope formula bad
NISA [10]
Ok so this question:
y + 1 = - ( x - 2 )        (distribute the negative inside the parenthesis)
y + 1 = -x + 2             (substitute the y= -1)
-1 + 1 = -x + 2
0 = -x + 2                   (take two to the other side)
-2 = -x                        (divide the negative away from x)
2 = x

3 0
3 years ago
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