Question

please help!

x + 5y = -2
2x + y = 5

The point of intersection of the lines has a y-coordinate of _____.


-1
1
3

Answer 1

Your answer would be -1

Answer 2

What you do is for the second equation subtract 2x from both sides and u get y=-2x+5 then you substitute that in for y of the first equation and you should have x+5(-2x+5)=-2. Use the distributive property and and u should get x+(-10x)+25=-2. So when you compare like terms you get -9x+25=-2. subtract 25 from both sides and u get -9x=-27 divide both sides by -9 and x=3. then substitute that 3 in for x of the second equation so u can find y. so it would be y=-2(3)+5= -6+5=-1 so y=-1

Answer 3

Any questions? If not then if you need help with anything else let me know

Answer 4

and btw i fanned you

Answer 5

great explanation :) @jojo4eva

Answer 6

@jojo4eva thank you so much for your perfect explanation!

Answer 7

would you help me on this question too?

7x - 3y = 4
2x - 4y = 1

Which of the following systems is not the same as solving the system shown?


28x - 12y = 16 and -6x + 12y = -3
14x - 6y = 4 and -14x + 28y = 1
-28x + 12y = -16 and 28x - 56y = 14

Answer 8

Ya

Answer 9

I believe the answer is A please someone correct me if im wrong. THe reason why i say is that if you look at A instead of cancelling out the X's in order to solve for y you are cancelling out the Y's whereas in #s 2 and 3 you are canceling out the X's

Answer 10

@tester97 please correct me if im wrong

Answer 11

Alternatively, multiply the first equation by -2.
Add the two equations together to eliminate the 2x terms.
Get
-9y = 9,
y=-1.

Answer 12

Yes he is correct

Answer 13

@tester97 am i wrong on the second one?

Answer 14

yea dats right cos 7x - 3y = 4 times 3 is 28x - 12y = 16

and 2x - 4y = 1 times 3 is -6x + 12y = -3

Answer 15

Ok so anything else @ttop0816

Answer 16

@jojo4eva i promise this is the last one!

x + y = k
x - y = k

The solution to the system shown is _____.


(0, k)
(2, 2)
(k, 0)

thank you so much for @jojo4eva & @tester97 )): if it wasnt for you guys i wouldnt have understood these problems!

Answer 17

I believe the answer is B. @tester97 Correct me if im wrong i want to make sure she has the correct answer before she goes.

Answer 18

well the y cancels it self out so that leaves you with x=k both times. so we now know what x is correct?

Answer 19

tru tru

Answer 20

so we can eliminate answer choice A and B right?

Answer 21

got it got it!!! Do u get it @ttop0816