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-please answr all questions and give work thanks all help is appreciated In Exercises 1-3, solve the system by the method of substitution. Check your solution graphically. 1. X - Y=6 2. I 3. 4x - y = 7 3x + 5y = 2 X-V=3 In Exercises 4-6, solve the system by the method of elimination. 4. [2x + 5y = - 11 5. 3x - 2y + 2= 0 6. 5x - y= 19 fix + 2y + 3z = -2 2x - 5y+ 1= 0 3x - 4y + 52 - 5 3x - 3y + 2:= -1 7. Find the equation of the parabola y = ar + bx + c that passes through the points (0. 6). (-2. 2). and (3. )