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what di di do wrong in this??? the question is: x8y=18 16x+16y=8 i did : first multiplied the first equation with 2 then 2x16y=36 16+16y=8  14x=28 x=28/14 x=2 now x8y=18 (2)8y=18 8y=18+2 8y=20 y=20/8 y= 
Math I really need help!
Multiply and simplify by factoring. Assumem that all expressions under radicals represent nonnegative numbers. ∛(y^13) ∛(16y^14) ∛y^13 x 16y^14 ∛16y^27 Am I even close here? 
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Q: Convert 4x^2 + 4y^2 8x 16y 29 = 0 into standard form. I first started by pairing the like terms together, getting: 4x^2 8x + 4y^2 16y = 29 The next step, I'm a little confused. I know I need to complete the square, but I'm 
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solve the system by addition: 5x9y = 5 x+5y=15 I've tried this one over and over, but I can't seem to get the right answer. I don't even really know where to start. each time i try to do it, i go about it a little differently 
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Which rectangular equation corresponds to these parametric equations? x = 0.2sec t and y = 0.25tan t A) 25x^2 − 16y^2 = 1 B) 25x^2 + 16y^2 = 1 C) x^2 − 16y^2 = 25 D) 25y^2 − 16x^2 = 1 E) 4x^2 − 16x^2 = 1 
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What are the factors of the following trinomial? 16y^2  12y + 2 a) (4y  1) (4y  2) b) (2y  1) (8y + 2) c) (16y  1) (y  2) d) (8y  1) (2y  2) i think a but i can be wrong 
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9x^2+16y^218x+64y71=0 find the coordinates of the center, the foci, and the vertices of this ellipse. 9x^2+16y^218x+64y71=0 9x^218x+16y^2+64y=71 9(x^22x)+16(y^2+4y)=71 9(x^22x+1)+16(y^2+4y+4)=71 
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I have 70 problems today and have trouble near the end if I can get help on the ones I am going to to post I can do the last 15. I so appreciate help with understanding the steps. I will split the posts. Thank you very much. I 
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Simplify: [(4x^3y)(4^2xy)^1]/(4xy^2) A. x /16y^2 B. 16x/y^2 C. x^2/16y D. y/16x^2 
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(4y+5)(4y5) 16y^220y+20y25 16y^225 Am I correct