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ABC is a straight line.
The length of AB is four times the length of BC.
AC = 75 cm.
Work out the length of AB.

ABC is a straight line The length of AB is four times the length of BC AC 75 cm Work out the length of AB class=

Respuesta :

Answer:

Step-by-step explanation:

What is known....AC=75      AB=4 times BC   AB+BC=AC

4(BC)+BC=75        Add like numbers

4(BC)+BC=5BC

5(BC)=75       get the variable(BC) alone by dividing both sides by the number(5)

5(BC)/5=75/5  Then simplify....5(BC)/5=(BC)  and 75/7=15

(BC)=15

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