3 years ago

-3x+y=5, y=7 solve using substitution

Mathematics

1 answer:

borishaifa [10]3 years ago

6 0

substitute 7 for y then solve for x

x = 2/3

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3 years ago

Find variable y<br> : -90=5y-20

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3 years ago

Tickets to a school play cost $3 for students and $8 for adults. On opening night, $1000 was collected and 150 tickets sold. How

vesna_86 [32]

Let the number of students who bought tickets be s,
Let the number of adults who bought tickets be a,

Equation 1:

$3s \: + \: 8a \: = \: 1000$

Equation 2:

$s \: + \: a \: = \: 150 \\ s \: = \: 150 \: - \: a$

Substitute ( 2 ) into ( 1 ),

$3(150 \: - \: a) \: + \: 8a \: = \: 1000 \\ 450 \: - \: 3a \: + \: 8a \: = \: 1000 \\ 5a \: = \: 550 \\ a \: = \: 110$

Substitute a = 110 into ( 2 ),

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Ans: 40 Student Tickets, 110 Adult Tickets

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