Step-by-step explanation:
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Since the final answer is -1, the missing number would be positive 3
Y = -1/2x + 3
Why?
Looking at the line start where the line intercepts the y line, it goes down one over 2 and that’s your slope, the 3 is bc that’s where the line crosses the y line
12 should be 25% just divide 10 by 40 which gives you .25 then multiply by 100 and that gives you 25%
20 should be 33.33& divide 7 by 21 that gives you .3333 muliply by 100 that gives you 33.33%
21 should be 7.5 since you multiply the percent by the whole to get the part which would be .15 multiply by 50 which is 7.5
