Question

2x - 3y = 68
5x + y = 51

Using the two equations above, solve for y.

Answer 1

5x-4,5y=170
5x+y=51
By substracting the second equasion from the first one we get
-3,5y=119
5x+y=51
So
y=-34
5x+y=51

Answer 2

A. y = -13
B. y = -12
C. y = -14
D. y = -15

Answer 3

@marie123
this is parralell equations. So first you get x or y by itself for one of the equations and then you subsitute it in.
2x - 3y = 68
add 3y to both sides
2x=68 + 3y
divide both sides by two
x=34 + 3/2y
Now subsitute all the x's in the next equation with 34 + 3/2y
5(34 + 3/2y) + y = 51
use the distributive property.
170 + 7.5y + y = 51
Now combine like terms
170 + 8.5y = 51
Subtract 170 from both sides.
8.5y = -119
Divide both sides by 8.5
y = -14

So the answer would be C. Hope this helped! :D

Answer 4

thanks so much, not so good with this stuff so thank you

Answer 5

Just remember for problems like this you isolate one of them, then substitute in the next. :)