−7x−5y=36 x= 2y+3 wjats y and whats x?
1 answer:
Answer:
y = -3 and x = -3
Step-by-step explanation:
-7x-5y = 36.........(1)
2y+3 = x............(2)
since in equation (2), x has already been made subject of formula we will substitute equation (2) in (1)
sub (2)in (1)
-7(2y+3)-5y =36
-14y-21-5y = 36
-14y-5y= 36+21
-19y =57
to make y subject, we divide both sides by -19
-19y_
y = -3
sub y in equation (2)
2(-3)+3=x
-6+3=x
-3 =x
this implies that x = -3
therefore, y = -3 and x = -3
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Answer:
Step-by-step explanation:
Let the total number of votes to choose a color = x
Number of votes for blue =
Remaining votes = x -
=
=
Votes for green =
=
=
Finally remaining votes =
=
=
=
Since these votes are for red therefore,
= 48
x = 48×6
= 288
a) Votes for blue are
Therefore, exact number for blue votes =
= 5×36
= 180
b). Votes for green =
=
= 60
c). Since 25 students were absent on that day of the vote, number of students at Riverside Elementary School = 288 + 25
= 313
d). Since seven tenths of the votes for blue were made by the girls.
Therefore, number of girls voted for blue =
= 7×18
= 126
Since total votes made = 288
Therefore, half of the votes made =
= 144
Now it's clear that number of votes made by girls is less than half of all the votes.
e). 126 girls voted for blue.