Given the point (5, 6) and the slope of 5, find y when x = 21.

Y = mx + b(5,6)
slope(m) = 5
now we sub
6 = 5(5) + b
6 = 25 + b
6 - 25 = b
- 19 = b

so ur equation is : y = 5x - 19...now we sub in 21 for x
y = 5(21) - 19
y = 105 - 19
y = 86

so when x = 21, y = 86

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