How do you solve the system of equations $8 x - 3 y = - 21$ $8x - 3y = - 21$ and $y = 5 x$ $y = 5x$ ?

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Answer 1 · 2017-03-26T22:54:55

$- 7 x$ $-7x$

Subsitute $y = 5 x$ $y=5x$ into the first equation and simplify.
$8 x - 3 (5 x) = 8 x - 15 x = - 7 x$ $8x-3(5x) = 8x-15x = -7x$

How do you solve the system of equations 8x−3y=−218x - 3y = - 21 and y=5xy = 5x?