Answer:
x=3
y= -1
Explanation:
with 1 equation you can solve for 1 variable. With 2 equations you can solve for 2 variables. This is solvable.
6x-7y = 25
15x+3y = 42
first simplify to make easier to work with
6x-7y = 25 can not be factored further
15x+3y = 42 can be divided by 3 on both sides
5x+y = 14
----- then you have
6x-7y = 25
5x+y = 14
solve by substitution:
isolate y in second equation
5x+y = 14 ----> y= 14-5x
put y into first equation
6x-7(14-5x) = 25
6x- 98 --35x =25
6x- 98 +35x =25
41x =123
x=3
to get y, substitute x into equation
5x+y = 14
5(3) +y=14
15+y=14
y=-1
hope this helps !