Answer:
y = 9.25
Explanation:
I'm going to assume when you typed x=.3, that it is x = 0.3 and the "." is not a typo.
given:
5x+2y=20 (rearranging to express y in terms of x)
2y = 20 - 5x (divide both sides by 2)
y = 10 - (5/2) x
When x = 0.3, substitute this into the equation
y = 10 - (5/2) x
y = 10 - (5/2) (0.3)
y = 10 - 0.75
y = 9.25