exam Maths Puzzle Numerical Ability

i need to write a slope-intercept equation with these characteristics. please help me

m= -2, passes through (-5,1)

can you break it down easy for me thanx

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exam Other Question

How do you find points when there is no x like 2y=5
or how do I find a point when there is no y like x+6=0

Adult tickets for a play cost $11 and child tickets cost $10. If there were 23 people at a performance and the theater collected $246 from ticket sales, how many children attended the play?

thanks