Question

If y is directly proportional to (x + y)^2 and y = 32.4 when x= 4 calculate the value
of x when y = 169
​

Answer 1

Step-by-step explanation:

y is directly proportional to (x+y)²

y1/y2 =(x1+y1)²/(x2+y2)²

x1=4, y1=32.4,y2=169,x2=x

32.4/169 = (4+32.4)²/(x+169)²

169/32.4 = (x+169)²/36.4²

5.21 = (x+169)²/1324.96

(x+169)²=6911

x+169= 83.13

x= -85.87