3x+2y=10 and 2x+3y=-3

x =  −2 /3 y +  10 /3  and x =  −3/ 2 y +  −3 /2

Step-by-step explanation:

1. 3x+2y=10

3x+2y=10

3x+2y+−2y=10+−2y

3x=−2y+10

3x /3  =  −2y+10 /3

x =  −2 /3 y +  10 /3

2. 2x+3y=−3

2x+3y=−3

2x+3y+−3y=−3+−3y

2x=−3y−3

2x /2 = −3y−3/2

x =  −3/ 2 y +  −3 /2

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answer: d.) the total number of protons and neutrons is 15

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