1. What is the first step for solving this system by substitution? 3x-2y=8

Question

x+7y=10

2. How many solutions does this system of equations have? 3y-6x=12
y-2x=4

Answer 1

#1
I would isolate the x in the second equation,
that is, x = 10-7y
then substitute into the first equation.

#2
an infinite number of solutions, since the first equation is simply 3 times the second.