It would help if you would proofread your work before you post it.
Online, “*” is used to indicate multiplication to avoid confusion with “x” as an unknown.
Online "^" is used to indicate an exponent, e.g., x^2 = x squared.
X is partaly costana and patly varies as y when y 2 x 30 and when y 6 x 50 find x when y 3
2 answers
x = a y + b
30 = 2 a + b
50 = 6 a + b
----------------------- subtract
-20 = -4 a
a = 5
so
x = 5 y + b
50 = 6 * 5 + b
b = 50 - 30 = 20
so
x = 5 y + 20
if y = 3
x = 5 * 3 + 20 = 15+ 20 = 35
30 = 2 a + b
50 = 6 a + b
----------------------- subtract
-20 = -4 a
a = 5
so
x = 5 y + b
50 = 6 * 5 + b
b = 50 - 30 = 20
so
x = 5 y + 20
if y = 3
x = 5 * 3 + 20 = 15+ 20 = 35