Question

The first side of a triangle is 7 cm shorter than twice the second side. The third side is 4 cm longer than the first side. The perimeter is 90 cm. Find the length of all three sides.

Please answer! Im giving half of all my points!!

Answer 1

first side = 33

second side = 20

third side = 37

Explanation:

first side = 2x-7

second side = x

third side = (2x-7)+4

(2x - 7) + x + (2x - 7) + 4 = 90

5x - 14 + 4 = 90

5x - 10 = 90

+10 +10

5x = 100

x = 20

first side:

2(20)-7

40 - 7 = 33

second side: 20

third side:

(2(20) - 7) + 4

(40 - 7) + 4

33 + 4 = 37