Answer: We can start by solving for one variable in one of the equations and then substituting that value into the other equation.
Solve for y in the first equation: y = 1 - 3x
Substitute this value of y into the second equation: 4(1 - 3x) + 4x = -20
Solve for x: -4x = -24
x = 6
Substitute this value of x into the first equation to find the value of y: y = 1 - 3(6) = -17
So the solution is x = 6 and y = -17.
Explanation: