anonymous
  • anonymous
3. Where do the lines y = 3x + 5 and 5x + 5y = 25 intersect?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
(A) (7, 6) (B) (5, 0) (C) (0, 5) (D) (4, 2)
anonymous
  • anonymous
The answer is C but I don't know how
Nnesha
  • Nnesha
there are different ways to find solution graphing substitution elimination matrices

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More answers

Nnesha
  • Nnesha
graphing is easy just type equation into the calculator to check your answer plugin x =0 and y=5 in both equations
anonymous
  • anonymous
I can't use calculators for the test
Nnesha
  • Nnesha
alright thats fine then substitution method
anonymous
  • anonymous
i keep getting 20x what do I do next
Nnesha
  • Nnesha
or elimination for this equation (first equation) is already solved for y so substitution would be easy
Nnesha
  • Nnesha
Nnesha: substitution: replace y with first equation Nnesha: 5x+5(3x+5)=25
Nnesha
  • Nnesha
what about 25 ??
anonymous
  • anonymous
I don't know what to do next
anonymous
  • anonymous
i substituted it but i got a different answer
Nnesha
  • Nnesha
5(3x+5) distribute by 5 15x+25 \[\huge\rm \color{Red}{5x+15x}+25=25\] combine like terms that's how u got 20x \[\color{Red}{20x }+25=25\]
Nnesha
  • Nnesha
can you solve for x??^^
anonymous
  • anonymous
0?
Nnesha
  • Nnesha
right subtract 25 both sides |dw:1447006150028:dw| 0 divide by anything = 0 so yes that's correct
Nnesha
  • Nnesha
now substitute x for 0 into the first (or 2nd equation doesn't matter )
Nnesha
  • Nnesha
and then solve for y that's it! :=))
anonymous
  • anonymous
oohhhh
anonymous
  • anonymous
I GET IT 0,5
Nnesha
  • Nnesha
yes!! :=)
anonymous
  • anonymous
THANKS SO MUCH YOU'VE SAVED A LIFE
Nnesha
  • Nnesha
np :=)) good luck!
anonymous
  • anonymous
I became a fan

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