Which system of equations corresponds to this matrix multiplication operation? 5 2 11 7 -5 -5 3 1. -- (167 = 3 12) A. 5x + 2x + x = 16; 7y - 5y + 2y = 3; -5z + 3z + z = 12 B. 5x + 2y + z = 16; 7x - 5y + 2z = 3; -5x + 3y + z = 12 C. 5x + 7y + -5z = 16; 2x - 5y + 3z= 3; x + 2y + z = 12 D. 5x + 7y + -5z = 12; 2x - 5y + 3z= 3; x + 2y + z = 16​

the aswere is the one with all 8's and the second one is with the 10,8 and 6

step-by-step explanation:

191 students play sports and ninety-seven 10th graders were surveyed.

step-by-step explanation:

starting with:    

5 + x - 12 = 2x - 7   

5 + x - 12 - x = 2x - 7 - x (subtract x from both sides)   

5 - 12 = x - 7 (combine and cancel x's from both sides)   

5 - 12 + 7 = x - 7 + 7 (add 7 to both sides)   

0 = x (add numbers together on both sides)       

so in order for the equation to be true, x must be 0.   

trying x = -0.5   

5 + x - 12 = 2x - 7 (original equation)   

5 + -0.5 - 12 = 2(-0.5) - 7 (plug in value of x)   

5 + -0.5 - 12 = -1 - 7 (did multiplication)   

-7.5 = -8 (did addition on both sides)       

since -7.5 is obviously not equal to -8, the value of -0.5 for x is wrong.   

trying x = 0   

5 + x - 12 = 2x - 7 (original equation)   

5 + 0 - 12 = 2(0) - 7 (plug in value of x)   

5 + 0 - 12 = 0 - 7 (did multiplication)   

-7 = -7 (did addition on both sides)       

since -7 equals -7, that demonstrates that the value of 0 for x is correct.   

trying x = 1   

5 + x - 12 = 2x - 7 (original equation)   

5 + 1 - 12 = 2(1) - 7 (plug in value of x)   

5 + 1 - 12 = 2 - 7 (did multiplication)   

-6 = -5 (did addition on both sides)       

since -6 is obviously not equal to -5, the value of 1 for x is wrong.

answer: 323 is how many she has ☃☃⛄❄

step-by-step explanation: