Create an equivalent system of equations using the sum of the system and the first equation.
−3x + y = 12
x + 3y = 6
a.−3x + y = 12
−2x + 4y = 18
b.−3x + y = 12
−3x + 4y = 18
c.−3x + y = 12
x + 4y = 18
d.−3x + y = 12
−2x + 4y = 6

That is right sorry i was gonna answer but i already saw his

One shot. if 60% of 10 is 6, then what is 70%? we know it would be seven (since 60% is mathematically 60/100, or 6/10, then 70% is 70/100, or 7/10) but we can check anyway using ratios: 6 : 60% = x : 70%*inverse multiplicationx * 60% = 6 * 70%*divide both sides by 60%x = (6 * 70%) / 60%x = 7and since he has made 6 shots already, he would need just one more to get 7 shots or 70%. if the explanation is too confusing, comment and i will try to