Question

Solve for x please describe the steps 50 points

Answer 1

Answer:

x = 6

explanation:

USE: $\boxed{\frac{side-length }{base -length} = \frac{side-length}{base -length} }$

solve:

$\frac{21}{15} = \frac{7}{x-1}$

$21(x-1) = 7(15)$

$21x-21 = 105$

$21x = 105+21$

$21x = 126$

$x = \frac{126}{21}$

$x = 6$