Solve this system of linear equations
y=3x+1
-x+2y=-3

Substitute 3x + 1 for 'y' in the 2nd equation:

-x + 2(3x + 1) = -3

Distribute 2:

-x + 6x + 2 = -3

Combine like terms:

5x + 2 = -3

Subtract 2 to both sides:

5x = -5

Divide 5 to both sides:

x = -1

Plug this into any of the two equations to find 'y':

y = 3x + 1

y = 3(-1) + 1

y = -3 + 1

y = -2

So our solution is (-1, -2).