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4 years ago

How do you do 3.)and 3.a)

Mathematics

1 answer:

malfutka [58]4 years ago

7 0

1 cm : 15 yd
Multiply this proportion by 5
5 cm : 75 yd

Multiply the original proportion by 8
8 cm : 120 yd

a) The dimensions of the field are 75 yd by 120 yd.

b) The area is (75 yd)*(120 yd) = 9000 yd^2.

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Step-by-step explanation:

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3 years ago

zepelin [54]

Answer:

Multiply the first equation by 3 and multiply the second equation by -2.

This is justified by the multiplication property of equality

Step-by-step explanation:

we have

$2x+5y=7$ ----> first equation

$3x+4y=6$ ----> second equation

step 1

Multiple the first equation by 3 both sides

$3(2x+5y)=3(7)$ -----> by multiplication property of equality

$6x+15y=21$ ----> new first equation

step 2

Multiple the second equation by -2 both sides

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step 3

Solve the system of equations by elimination

Adds new first equation and new second equation

$6x+15y=21\\-6x-8y=-12\\-------\\15y-8y=21-12\\7y=9\\y=\frac{9}{7}$

Find the value of x

substitute the value of y in any equation and solve for x

$6x+15y=21$

$6x+15(\frac{9}{7})=21$

$6x=21-\frac{135}{7}$

$6x=\frac{12}{7}$

$x=\frac{2}{7}$

The solution is the point $(\frac{2}{7},\frac{9}{7})$

therefore

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