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Tutors Answer Your Questions about Coordinate-system (FREE)
Question 514715: Determine how many solutions exist.
Use either elimination or substitution to find the solutions (if any).
Graph the two lines, labeling the x-intercepts, y-intercepts, and points of intersection.
y = 2x + 3 and y = -x - 4
I have found that there is one solution. Here's what I have so far:
First I subtracted the first equation from the second equation.
y = -x - 4
-y =-2x - 3 --> 0 =-3x - 7 I add 7 to both sides to get: 7 = -3x
Then I divide both sides by -3 to get x = -7/3 or x = -2.333
Then I substituted -2.333 in for x in the first equation to find y which came out to -1.666 (when x is -2.333). I came up with intercept points reduced to the hundreths as (-2.33,-1.67) to get the intercept point. Thanks.
Click here to see answer by mananth(12270)  |
Question 523980: 1.(5x+2)(5x-2)-(x+3)^2
my answer is
(5x+2)(5x-2)=5x^2-2^2=25x-4
-(x+3)^2 = -x2+x*2*3+32= -x2+6x+9
-x2+6x+9+25x-4=-x2+31x+5.
2.solving Y=2x+1
Y=3x-1
when i do that with the calculater i get diffrent result then when solve it with algebraic solution
this is what i get from the calculator 1,7x;4,49y and this is what i get when i try algebraic solution 2,5x;6y
plz help and tell me what i am doing wrong.
Click here to see answer by Edwin McCravy(8893)  |
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Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925
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