exam Maths Puzzle Numerical Ability

IF lea is 6 years older than Sue and john is 5 yrs older than lea and the toatl ages are 41 then how old is Sue.

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I need help with slope and y intercept form.

Solve 3x+4y=8 for y then determine what is the slope and y intercept of this?
need help could u explain each step thanks

2x-y=6
x=13-2y equations by substitution

thank you so much homework