Mathematics, 01.07.2019 01:10 happyabbie23
If a + b = -1 and x + y + z = 2, what is 7a + 7b +6z +6x + 6y?
Answers: 2
![\bf \begin{cases} a+b=-1\\ x+y+z=2 \end{cases} \\\\[-0.35em] ~\dotfill\\\\ \begin{array}{llll} 7a+7b\qquad &+6z+6x+6y\\\\ 7(a+b)&+6(z+x+y)\\\\ 7(a+b)&+6(x+y+z)\\\\ 7(-1)&+6(2)\\\\ -7&+12&\implies 5 \end{array}](/tpl/images/0036/8850/432e0.png)
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If a + b = -1 and x + y + z = 2, what is 7a + 7b +6z +6x + 6y?...
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