Given system of equation: y=-1/5x +1 Equation 1 y=x+4 Equation 2 Substitute value of y in equation 2. x+4=-1/5x+1 Multiply both sides by 5. 5x+20=-x+5 Add x to both sides 6x+20=5 Subtract 20 from both sides 6x=-15 x=-15/6 x=-5/2 Now substitute value of x in equation 1. y=-1/5 ( -5/2) +1 y=1/2+1 y=3/2