B. Rewrite the equation in standard form using integers. A y + 9 = 4(x - 9); -4x + y = -45
B y - 9 = 4(x + 9); -4x + y = 45
C y - 9 = 4(x - 9); -4x + y = 45
D y + 9 = 4(x + 9); -4x + y = -45

danielu suge pula

explanation:

the perimeter of a triangle is 69 cm. side a is 5 cm shorter than side b. side c is twice as long as side a. find the length of each side. i need to know how to do it in 2 equations.  

equations:

a = b-5

c = 2a

a + b + c = 69

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