Answer:
Step-by-step explanation:
Actually Welcome to the Concept of the linear equations..
Here given value of x= 5 and y =1 , so we get as,
5a + b = 38 and 5b - a = 8
so, now we multiply equation no. 2 by 5 all over.
==> 25b - 5a = 40....(1)
hence adding new equation and equation no. 1
26b = 78
b = 78/26
hence b = 3 , and a = 7
X equals 90 because 360 /2=
3.14 x 3 about 9 would be the answer
His rate = d/t because d=rt
So r = 5/2 = 2.5 mi/hr
So d = 5/2•t