book Maths Puzzle Numerical Ability

find the x- intercept of the line 5x-2y=10

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book Other Question

The sides of a square measure 7 feet. How long is the diagonal?

9.9 ft
9.7 ft
11.2 ft
10.3 ft

I dont need the answer, I just would like an explanation on how to solve this.
the chocolate factory Blends it double-dark-chocolate fudge, which is 35% fat, with its peanut butter fudge, which is 25% fat, to obtain double-dark -peanut fudge, which is 29%fat.