a: 5,-5
b:-5,5
c:-5,6
d:6,-5
*this is not homework..... i was looking through my workbook since the 7th grade....i got it wrong then and i still got it wrong now*
2007-06-06 19:34:21 · 10 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
The answer is a.
3(x) + 2(y) = 5
3(5) + 2(-5) = 5
15 + (-10) = 5
15 - 10 = 5
5 = 5
2007-06-06 19:40:10 · answer #1 · answered by Megan 2 · 0⤊ 0⤋
Even if you wasnt given options to chooce from, you could solve the equation similar to how you would solve any equation.
if 3x + 2y = 5
then
2y = 5 - 3x
which means :
y = 2.5 - 1.5 x
so any answer can easily be checked by placing the value into x and there will be just the one value of y that will make the equation true.
try a) by putting 5 into x to give :
y = 2.5 - (1.5 x 5)
y = 2.5 - 7.5
y = -5
so if x is 5 y is -5 therefore a) is a solution,
you can try doing the same for b c and d but you will find that none of them are solutions to the equation
y = 2.5 - 1.5 x
so only a) is the correct answer there. Note that you should check all the answers as the equation can have many solutions, for example x = 3, y = -2 would be another solution
which would work.
2007-06-07 01:58:45 · answer #2 · answered by MARTIN B 4 · 0⤊ 0⤋
it's (a) undoubtedly!!
3(x) + 2(y) = 5
3(5) + 2(-5) = 5
15 + -10 = 5
15 - 10 = 5
5 = 5
2007-06-06 20:11:20 · answer #3 · answered by Anonymous · 0⤊ 0⤋
3x +2y=5
by substitute a answer,
3x+2y
=3(5)+2(-5)
=15-10
=5#
by substitute b answer,
3x+2y
=3(-5)+2(5)
=-15+10
=-5----not equal to 5
by substitute c answer,
3x+2y
=3(-5)+2(6)
=-15+12
=-3----not equal to 5
by substitute d answer,
3x+2y
=3(6)+2(-5)
=18-10
=8----not equal to 5
so the answer a.
2007-06-06 19:44:46 · answer #4 · answered by jackleynpoll 3 · 0⤊ 0⤋
3 x 5 + (2 x -5) = 15 - 10 = 5
ANSWER a.
2007-06-06 19:42:33 · answer #5 · answered by Como 7 · 0⤊ 0⤋
yeah, it is a: 5, -5.
Just substitute the ordered pairs one by one into the equation 3x + 2y=5.
first number is x, second is y. order pair: (x, y)
(5, -5) is the only pair that works.
x= 5
y= -5
3x+2y=5
3(5)+2(-5)=5
2007-06-06 19:41:57 · answer #6 · answered by Diane S 2 · 0⤊ 0⤋
correct answer:a
put the values of x and y in the equation and you get your answer.
3(5)+2(-5)=5
15+(-10)=5
15-10=5
anyways in which grade are you in right now?
2007-06-06 19:43:58 · answer #7 · answered by Anonymous · 0⤊ 0⤋
a.
(3*5)+(2*-5)=15+(-10)=15-10=5
2007-06-06 22:55:55 · answer #8 · answered by moon r 2 · 0⤊ 0⤋
the answer is a) you just hae to make the substitution in the quation and both sides must be equal
2007-06-06 19:40:07 · answer #9 · answered by Víctor V. 2 · 0⤊ 0⤋
a
2007-06-06 19:38:05 · answer #10 · answered by Anonymous · 0⤊ 0⤋