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13 Answers
- Engr. RonaldLv 71 decade agoFavorite Answer
5x-3y=8 equation 1
x=7y/5 equation 2
substitute x=7y/5 to 5x-3y=8
5(7y/5)-3y=8
35y/5-3y=8
7y-3y=8
4y=8
y=2 answer//
- An ESL LearnerLv 71 decade ago
5x - 3y = 8 (solve by using substitution)
x = 7y/5
5x - 3y = 8
5(7y/5) - 3y = 8
7y - 3y = 8
4y = 8
y = 8/4
y = 2
∴ y = 2
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- 1 decade ago
5x - 3y = 8
5 (7y / 5) - 3y = 8
7y - 3y = 8
4y = 8
y = 2
Thanks for the two points, sharaont.
- 1 decade ago
5(7y/5)-3y=8
5 get cancelled each other so
7y-3y=8
you added 3y to 8 so
7y=8+3y
then divided by 7 so
y= (8+3y)/7
i think..i hope hehe
- ?Lv 44 years ago
Multiplying 2x+3y=8 by potential of 5 we get 10x+15y=40 Multiplying 5x-y=3 by potential of two we get 10x-2y=6 Subtracting the 2nd from the 1st we get 10x+15y-(10x-2y)=40-6 10x+15y-10x+2y=34 17y=34 y=(34/17)=2 putting fee of y in 2x+3y=8 2x+(3*2)=8 2x+6=8 2x=2 x=a million
- Anonymous1 decade ago
5(7y/5)-3y=8
7y-3y=8
4y=8
y=2
You need to substitute 7y/5 for x and multiply it by 5 before continuing with anything.
