book Maths Puzzle Numerical Ability

add the x and y intercepts in 3x+5y=12

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book Other Question

Ok, got another one from homework test problems. Don't know what book it comes from.
The function S(t)=308.7-4.1t can be used to estimate the total Bahamian sales of snow-tires, i
Find the equation if
X Y
0 9.5
1 9
2 8.5
3 8