2.5 inches equal 10 feet, how many inches does 12 equal?

You can make a proportion.

2.5     x
=
10      12

then cross multiply and divide

12 times 2.5=30 divide by 10=3

3 inches is your answer

12 times 2.5=30 divide by 10=3

3 inches is your answer

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Abit confused about what you mean, but i think you might be referring to slope intercept form: y = mx + bin that case b, or the y intercept is already given.(0,-1)find the slope by using the formulay2 - y1/x2 - x1the final slope will be 4/2, equivalent to 2.now your equation should look like thisy = 4/2x -1sorry if this didn’t you out!