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Find an equation for the linear function which has slope -10 and x-intercept -7

The tuition costs, c, for a local community college are modeled by c(h) = 250 + 200h, where h represents the number of credit hours taken. the local state university has tuition costs, s, modeled by the function s(h) = 300 + 180h. how many credit hours will a student have to take for the two tuition costs to be equal? round the answer to the nearest tenth of an hour.

When i'm with my factor 5, my prodect is 20 .when i'm with my addend 6' my sum is 10.what number am i