5x+2y+ 2z=7 15x+6y +6z=7 2x-5y+2z=4

for equation 1 is 5, 2 and 0

Step-by-step explanation:

Step 1: you know the answer to this eqution is 7 but you don't know what numbers do you  put in place of the variables to get 7 so you have to figure out the numbers.

Step 2: 5x + 2y + 2z = 7 okay so the number is very low and if we multiply 5, 2, or 2 by 2 then we won't get 7 so the answer will most likely be multiply each number by 1 EXCEPT the last 2.

Step 3: so lets change the equation 5 x 1 + 2 x 1 + 2 x 0= 7 and lets solve it 5 + 2 + 0 = 7

So your answer is 5, 2 and 0  

you can comment on this question an ill answer the rest in the comments

please mark me brainliest

for the first question it would be the second answer for the second question it would be the third answer and for the third question it would be the first answer

step-by-step explanation:

nlgqer

step-by-step