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4 years ago

Solve the system by subsitutuon || x - 3y = -18 5x - 3y = 6

2 answers:

5 0

X=3y-18
Sub that X=3y-18 into equation 2
5(3y-18) -3y =6
15y - 90 - 3y = 6
15y - 3y = 6 + 90
12y = 96
12y/12 = 96/12
Y = 8

Then sub y=8 in the first equation
x - 3(8) = -18
x - 24 = -18
x = -18 + 24
x = 6

Therefore the solution is (6,8)

levacccp [35]4 years ago

3 0

Answer:

y=6.4

x=5.04

Step-by-step explanation:

x=3y-18

5(3y-18)=6

15y-90=6

15y=96

y=6.4

5x-3(6.4)=6

5x-19.2=6

5x=25.2

x=5.04

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