How to draw the last x.y image? For example, x + y = 3 ① 3x – y = 5 ② From ① we can get y = – x + 3 and from ② we can get y = 3x – 5 Then I learned that x = 4, y = – 1 How to draw that line

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• 1. Using function image method to solve binary linear equations {3x-2y=8 {y+4x=7 Key picture
• 2. When using the image method to solve a system of quadratic equations of two variables, the image of two corresponding functions of one order in the same rectangular coordinate system, the quadratic power of the solution When using image method to solve a system of quadratic equations of two variables, the corresponding images of two quadratic functions are made in the same rectangular coordinate system. The system of quadratic equations of two variables solved is a.x + Y-2 = 0; 3x-2y-1 = 0; b.x + Y-2 = 0; 2x-y-1 = 0 C.2x-y-1=0 ;3x+2y-5=0 D.2x-y-1=0 ; 3x-2y-1=0 Supplementary picture
• 3. One problem of quadratic equation of one variable in mathematical function It is known that the value of algebraic formula x (x + 5) + 10 is opposite to that of algebraic formula 9x-25
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• 5. Exercises of quadratic equation of one variable
• 6. Ask you math masters to help me solve a problem of solving quadratic equation of one variable The square of X - 16x - 9 = 0, how to solve it by factoring, teach me, the best process is detailed, so that I can understand, I can't just copy the answer
• 7. A problem of quadratic equation of one variable A volleyball invitational tournament should be organized in a certain place. Every two teams participating in the tournament should have a match. According to the venue and time conditions, the first round of the tournament is planned to be 4 days and 7 matches a day. How many teams should the organizer invite to participate in the tournament
• 8. Quadratic equation of one variable from the point of view of function It is known that the image of quadratic function y = x ^ 2 - (M + 1) x + m intersects two points a (x1,0) and B (x2,0), the positive half axis of intersection Y axis is at point C, and X1 ^ 2 + x2 ^ 2 = 10; (1) Find the analytic expression of quadratic function; (2) Whether there is a straight line passing through point d (0,2.5) intersecting with parabola and points m, n intersecting with X axis at point E, so that points m, n are symmetrical with respect to point E. if there is, the analytical expression of straight line Mn is obtained. If not, the reason is explained
• 9. A problem of quadratic equation of one variable from the point of view of function The list lattice is the corresponding value of the independent variable X of the quadratic function y = ax ^ 2 + BX + C and the function value y, and the judgment equation AX ^ 2 + BX + C = 0 The range of a solution X of (a ≠ 0, a, B, C are constants) is_________ (the answer is 6.18 < x < 6.19) x 6.17 6.18 6.19 6.20 y -0.03 -0.01 0.02 0.04 Now that we have known the three points on the quadratic function, we have determined the function graph and the relationship with the x-axis - whether there is an intersection point. Then the solution X of the equation AX ^ 2 + BX + C = 0 determines the value ah, how is the value range
• 10. How to talk about quadratic equation of one variable from the point of view of function? I'm in urgent need of a courseware or manuscript for teaching quadratic equation of one variable from the point of view of function
• 11. It is known that two X 1 and x 2 of the quadratic equation AX2 + BX + C = 0 satisfy x 2 / x 1 + x 1 / x 2 = 14 / 5, and the image of the inverse scale function y = A / X intersects the symmetric axis of the parabola y = AX2 + BX + C at the point (6, - 1 / 12)
• 12. Why is it a piecewise function? Definition of piecewise function: for different value ranges of independent variable x, there are different corresponding rules. Such a function is usually called piecewise function Am I trying to get to the top of this problem
• 13. Y = x & # 178; - 2x + 2, X ∈ [T, t + 1], find the maximum value of function (expressed by T)
• 14. A = {x | x > 0, X ∈ r}, B = {y | y ∈ r}, the corresponding relation F: X - &; Y & ᙧ 178; = 3x indicates whether y is a function of X?
• 15. Which of Y & # 178; = x or y = absolute value x can indicate that y is a function of X,
• 16. Y = √ x + 1 ×√ X-1, y = √ X & # 178; - 1 is equal function? Why?
• 17. It is shown that the function f (x) = x & # 178; - 1 / X-1 is bounded near x = 1, and f (x) > 1
• 18. It is proved that the function y = 1 / X & # 178; is bounded on (1,2)
• 19. The set of intersection points between the image of function y = x + 1 and the image of function y = x * 2 + a (constant a ∈ R) is represented by enumeration
• 20. The number of intersections between the image of function y = (X & # 178; - 2x) &# 178; - 9 and X axis is