Question

Select the best possible first step to solving the system by first eliminating the y variable.

4x - 5y = 4
3x + 2y = -20
Choose one answer.
a. Multiply the first equation by -2 and multiply the second equation by 5.
b. Multiply the first equation by 2 and multiply the second equation by -5.
c. Multiply the first equation by 2 and multiply the second equation by 5.
d. None of the above

Answer 1

C

Answer 2

I really dont understand and any help is appriciated!

Answer 3

That will give you -10 and 10 which will cancel.

Answer 4

Oh man, thank you so, so much!

Answer 5

You're welcome! If you want it explained more in depth I can if you like.

Answer 6

Want to take a shot at another one and explain that one to me?

Answer 7

Sure.

Answer 8

If you were to use the substitution method to solve the following system, choose the new equation after the expression equivalent to x from the first equation is substituted into the second equation.

x + y = 2
3x + 2y = 9

Answer 9

Ok, for this one we need to get x by itself in the first equation.

Answer 10

Which would be x=-y+2 right?

Answer 11

Yes

Answer 12

so we have x=-y+2
and3x+2y=9
you put the x value into the second equation to get
3(-y+2)+2y=9

Answer 13

okay so it's like figuring out a regular equation