Question

PLEASE HELP :)
How many solutions does the system of equations have?

4.
y=5x+7 and 3y-15x=18
-one
-two
-inifinetly many
-none

5.
x-2y=6 and 3x-6y=18
-one
-two
-infinitely many

6.
y-7x=-14 and 7y-49x=-2
-one
-two
-infinetily many
-none

Answer 1

solve all of them for "y" check their slopes

if their slope is the same, that means their graph is just parallel lines, thus no solution

otherwise, they have 1 solution

if the equations end up being identical, then infinite solutions

Answer 2

4 none, 5 infinitely many, and 6 none i suppose.

Answer 3

thanks