Question

solve the system of equations y=2x-10 and x-y=7

Answer 1

By substituion:
put y=2x-10 in x-y=7
x-(2x-10)=7
x-2x+10=7
-x=7-10
-x=-3
x=3

Put x=3 in y=2x-10
y=2*3-10
y=-4

Answer 2

Graphically you can draw the lines and find the point of intersection.

Answer 3

There is one more method called Elimination :)

Answer 4

y=2x-10 can be changed into
2x-y=10

now subtract equation 2 from 1

2x-y=10
x-y=7
------------
x=3
put value of x in first equation you will get value of y.

Answer 5

oh

Answer 6

shahzadjalbani gave elimination method :)

Answer 7

ah i like that way better i think