# Questions on Algebra: Equations answered by real tutors!

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 Algebra: Equations Solvers Lessons Answers archive Quiz In Depth

 Question 45902: solve the system of equations x+5y+3z=4 4y+2z=6 z=-3 Click here to see answer by Nate(3500)

 Question 45901: (-1, -6) determine if the ordered pair is a solution 3x+y=-9 2x+3y=-20 Click here to see answer by Nate(3500)

 Question 45890: 2x^-4+x^-2-3=0 -16 -4x-3=0 -19=4x 19/4=x Hi is this right? Thank you for your help. Michelle Click here to see answer by Nate(3500)

 Question 45913: use substitution method. If the system has an infinite number of solutions, use set builder notation to writh the solution x+y=-9 x-y=14 Click here to see answer by Nate(3500)

 Question 45914: solve the system 3x-4y=-3 6x+2z=-7/2 2y-4z=4 i am stuck on all especially the fraction Click here to see answer by Nate(3500)

 Question 45884: 4y2+9=0 16+1y+9=0 y=-25 Is this correct? Thank you Click here to see answer by Nate(3500)

 Question 45903: solve the system of equations 3x-4y=-3 6x+2z=-7/2 2y-4z=4 Click here to see answer by abhijitvakil(7)

 Question 45986: Find the slope of any line perpendicular to the line through points (6, 3) and (7, 7). Click here to see answer by atif.muhammad(135)

 Question 45983: Write the equation of the line with x-intercept (12, 0) and y-intercept (0, 4). Click here to see answer by atif.muhammad(135)

 Question 45985: Given f(x) = –x – 4, find f(a – 3). Click here to see answer by Earlsdon(6287)

 Question 45984: Determine which two equations represent perpendicular lines. (a) y = 5/3x – 3 (b) y = 3x – 5/3 (c) y = -1/3x + 5/3 (d) y = 1/3x Click here to see answer by Earlsdon(6287)

 Question 45976: One number is 12 more than another. The sum of the smaller number and twice the larger number is 39. Find the larger number. Click here to see answer by mszlmb(115)

 Question 45978: Lane invested \$22,000, part at 8% and part at 7%. If the total interest at the end of the year is \$1,710, how much did she invest at 8%? Click here to see answer by Nate(3500)

 Question 45995: write the equations of 2 lines that are perpendicular Click here to see answer by fractalier(2101)

 Question 46154: Factor completely. 12x3 – 3xy2 A) 3x(2x + y)(2x – y) C) 3x(4x – y)(x + y) B) 3x(2x – y)2 D) 12x(x – 3y)(x – y) Click here to see answer by Earlsdon(6287)

 Question 46185: 12. Find the axis of symmetry. y = x2 – x + 10 Click here to see answer by Earlsdon(6287)

 Question 46180: 28. Factor completely. 21x2 + 33x + 12 Click here to see answer by checkley71(8403)

 Question 46179: 6x + 4(3x – 2) = 6x + 2 Click here to see answer by checkley71(8403)

 Question 46226: write standard form of equation where slope of passes through points. m=2, p(1,3) Click here to see answer by venugopalramana(3286)

 Question 46222: PROBLEM 7 i got wrong Factor completely. b2 – ab – 6a2 Click here to see answer by venugopalramana(3286)

 Question 46254: 37. Solve by using the quadratic formula. x2 – 8x – 9 = 0 Click here to see answer by venugopalramana(3286)

 Question 46250: 9. Factor completely. 5a2 – 125 A) 5(a – 5)2 B) 5a(a – 25) C) (5a – 1)(a – 125) D) 5(a + 5)(a – 5) Click here to see answer by venugopalramana(3286)

 Question 46256: 31. Rewrite the equation –8x – 5y = –45 as a function of x. Click here to see answer by tutorcecilia(2152)

 Question 46357: 13. Factor completely. x2 – 3x – 18 A) (x + 3)(x + 6) B) (x + 1)(x – 18) C) (x + 3)(x – 6) D) (x – 3)(x + 6) Click here to see answer by Nate(3500)

 Question 46361: book 31 i got this equation wrong. Rewrite the equation –8x – 5y = –45 as a function of x. Click here to see answer by mszlmb(115)