Solve each system by substitution
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To solve by substitution, you organize one of the equations in terms of one of the variables to replace it in the other.
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y = 6x (1)
2x + 3 y = -20 (2)
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In this case, (1) can be replaced in (2) to leave a single variable x
2x + 3 y = -20
2x + 3* (6x ) = -20
(2 + 18)x= -20
x = -20 / 20 = -1
x=-1
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Finally, you find y in any of the equations
y = 6x
y= 6*(-1)
y = -6
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Verifying
2x + 3 y = -20
2*(-1) + 3*(-6) =-20
-2 -18 = -20
-20=-20