Solve the system by substitution.

3x-7y=12
3x-12y=6

x=34/5 y=6/5

Step-by-step explanation:

so first you need to isolate one variable in one equation

so lets use 3x-12y=6

3x=12y+6

x=4y+2

then, as the name implies, we substitute it into the second equation

3(4y+2)-7y=12

then we simplify

12y+6-7y=12

5y=6

y=6/5

then we plug it in to find x

3x-7(6/5)=12

3x-42/5=12

3x=102/5

x=34/5

check work

3(34/5)-12(6/5)=6

102/5-72/5=6

30/5=6

6=6

.632

step-by-step explanation:

6 * 1/10 = 3/5

3*0.01 = 0.03

3/5 + 0.03 = .63

2*0.002 = .002

.63 + 0.002 = .632

3/20

step-by-step explanation:

well, there are 20 outcomes, and 3 of them you want. so, 3/20