Using substitution method to solve: 4x + 3Y = 5, x-2y = 4 Thank you

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• 1. The solution of one variable linear equation 2 (x-1) = 1 / 3 (4x-3) is?
• 2. Factorization; x2 [X-Y] + Y2 [X-Y] 2 is the square
• 3. If we know that 4f (x) + 3f (1 / x) = x, then the analytic expression of F (x) is that the solution of this problem 4f (x) + 3f (1 / x) = X Change x to 1 / X to get 4f(1/x)+3f(x)=1/x Two types of simultaneous Why change x to 1 / x? I haven't seen this kind of problem-solving method. The answers are good. I can only draw lots.
• 4. After exchanging the position of a two digit digit digit with the digit on the ten digit, a new two digit is obtained, which is equal to four seventh of the original two digit, Find the original two digits. If there are more than two two digits, what is the sum of these two digits
• 5. Sina = 2-2cosa to find Sina?
• 6. It is known that sina = 2cosa. Find the value of sin2a + 2sinacosa
• 7. It is known that sin α + sin β = √ 6 / 3, cosa + cos β = √ 3 / 3=
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• 9. 3sina + cosa = 0 find 1 / cos square a + 2sinacosa
• 10. If cosa + 3sina = 0, 2sinacosa cos ^ 2A + 1 is calculated=
• 11. Find the unknown x.1,3.2 * 2.5-75% x = 2.2,5x-5 * 1 / 3 = 0.8
• 12. To solve the inequality system: 5 ≤ 2x + 3 ≤ 7
• 13. The fifth power of polynomial ax + the third power of BX + (X-5) when x = 3, the value is equal to 7. When x = - 3, find the value of this polynomial fast The process is detailed ah
• 14. If the distance between point (4, a) and line 4x-3y-1 = 0 is not greater than 3, then the value range of a is () A. [0，10]B. [13，313]C. （0，10）D. （-∞，0]∪[10，+∞）
• 15. If the side length of regular triangle ABC is a, PA ⊥ plane ABC, PA = AB, then the distance from a to plane PBC is
• 16. Know the length of the three middle lines of the triangle and find the area of the triangle Given that the lengths of the three middle lines of a triangle are 3, 4 and 5, calculate the area of the triangle How to prove that the area of triangle ABC is equal to the area of six triangle BOD?
• 17. Points E and F are two points of diagonal BD of parallelogram ABCD, be = DF, find vector BC vector AE
• 18. In the triangular pyramid s-abc, if SA is vertical to BC, SA = BC = a, SA is vertical to de, BC is vertical to de, and de = B, the volume of the triangular pyramid s-abc is obtained
• 19. Given vector p1p = - 1 / 3, vector p1p2, vector PP2 = a, vector PP1, then a = - (seeking process) urgent!
• 20. In the parallelogram ABCD, e and F are the middle points of the edges AB and CD respectively, BD is the diagonal, and Ag / / DB is made through point a, and CB is crossed It is proved that the quadrilateral debf is rhombic if ∠ g = 90 ° at point G