Question

3x-2y=15
3x+2y=7

Answer 1

x=11/3
y=-2

Answer 2

y=-2
x=11/3

Answer 3

solve this using simultaneous equations. if you subtract them you get the answers above, understand?

Answer 4

i.e.
y = 3x-2y=15
y = 3x+2y=7
y = 0-4 = 8
y=8/-4
y=-2

Now you have a value for y put that back in the eqn and find x

Answer 5

like that
(3x+2y)+(3x-2y)=15+7
6x=22
x=11/3
same for y

Answer 6

(3x+2y)-(3x-2y)=7-15
4y=-8
y=-2

Answer 7

adding them u get

6x=22
x=11/3

substitute in 2nd equation

11+2y=7
2y=-4
y=-2

Answer 8

got it??

Answer 9

\[\sqrt{x+6}=2+\sqrt{x}\]