Question

Slove all of it please 100 points

Answer 1

Answer:

$\boxed{\mathrm{view \: explanation}}$

Step-by-step explanation:

Question 1:

$5x+y-7=0$

Write in slope intercept form.

$y=-5x+7 \\m=-5,b=7\\9x+7y-14=0$

Write in slope intercept form.

$7y=14-9x\\y=-9x/7 +14/7\\y=-9/7 + 2\\m=-9/7, b=2$

Question 2:

$x+y=1000\\4x+3y=3600$

$3x+3y=3000\\4x+3y=3600\\3x+3y-(4x+3y) = 3000-3600\\3x+3y-4x-3y=-600\\-x=-600\\x=600$

$x+y=1000\\600+y=1000\\y=1000-600=400$

Tickets sold:

Adults:

$x=600$

Kids:

$y=400$

Answer 2

Answer:

Step-by-step explanation:

5x+y-7=0 isolate y

y=-5x+7 (m=-5,b=7)

9x+7y-14=0

7y=14-9x ( divide both sides by 7)

y=-9x/7 +14/7

y=-9/7 + 2  (m=-9/7, b=2)

x+y=1000

4x+3y=3600 ( multiply the first equation by 3 to eliminate y)

3x+3y=3000

4x+3y=3600 ( subtract the two equations)

3x+3y-(4x+3y)=3000-3600

3x+3y-4x-3y=-600

-x=-600

x=600 ( substitute x in the equation)

x+y=1000

600+y=1000

y=1000-600=400

check : x+y=1000 , (600+400)=1000

check : 4x+3y=3600 = (4(600)+3(400))=2400+1200=3600

how many tickets are sold :

adults x=600/4=150

kids (y)=400/3=133 tickets+1 dollars left

unless( x represent kids then x=200, y represent adult = 100)