Mathematics: 33 points! ! use substitution to find the solution(s) to the system. -3x+12y=54 x-4y=-18 a) (-6, -1) b) (-3, -1) c) no solutions d) infinite solutions

33 points! ! use substitution to find the solution(s)

kennaklein2

10.03.2022

X = 4y - 18

-3(4y - 18) + 12y =54
-12y + 54 + 12y = 54
54 = 54

c

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bear342

04.03.2020

It is easy to multiply numbers by 10: you simply have to add an extra zero at the end.

This means that, using associative property, we know that

$87\times 5 \times 2 = (87\times 5) \times 2 = 87 \times (5\times 2)$

The last expression is the easiest to compute, because we have

$87 \times (5\times 2) = 87 \times 10 = 870$

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