Answer:Step-by-step explanation:6) the answer is option by = - x + 3x - y = 1From the graph, the point at which the lines of the two equations meet is the solution to the system of equationsThe points = x = 2 and y = 1If you substitute these values in option b, it satisfies the equations.7) the correct option is d-x + y = -3 - - - - - - -12x -y = 6 - - - - - - 2If we solve using elimination method, Multiply equation 1 by 2 and equation 2 by 1-2x + 2y = -62x -y = 6 Adding both equationsy = 0 and substituting y = 0 in equation 2,x = 3So y = 0 and x = 3So it has only one solution8) The lines of the two equations meet at a point where x = 3 and y = 0Option d is the correct answer-x +y = -32x - y = 6Substituting x = 3 and y = 0 in option d,- 3 + 0 = -36 - 0 = 69) y = x-2x = 17-4ySubstituting y = x - 2 in x = 17 - 4y, we havex = 17 -4(x - 2)Opening the bracketx = 17 - 4x + 8x + 4x = 17 + 85x = 25x = 25/5 = 5