Answered

3x-y=3
3x+y=-7
What is the answer?

Sagot :

Jers15viz
3x-y=3
3x+y=-7
-----------------------
6x=-4
x=-2/3

Substitute the value to any equation:
3x-y=3
3(-2/3)-y=3
-2-y=3
-y=5
y=-5

Hope this helps =)
3x-y=3
3x-3=y
3x+y=-7
3x+3x-3=-7
6x-3=-7
6x=-7+3
6x=-4
x=-2/3
3x-y=3
3(-2/3)-y=3
-2-y=3
-2-3=y
-5=y
check:
3x-y=3
3(-2/3)-(-5)=3
-2+5=3
check:
3x+y=-7
3(-2/3)+(-5)=-7
-2-5=7