Question

What is y=7x-10
y=-3

Answer 1

For a solution to exist for two lines, y=y so we can say:

-3=7x-10 add 10 to both sides

7=7x divide both sides by 7

x=1

So the solution is the point (1, -3)

Answer 2

-3=7x -10
-7x=-10+3
-7x=-7
x=1