Luena
30.01.2020 •
Mathematics
Solve the following system of equations. -7x-4y=14 -8x+5y=16
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Ответ:
x=-2 and y=0
Step-by-step explanation: Add 4y to both sides, then divide both sides by -7 to get x alone. X=-4/7y-2. Then substitute that in for x in the second part of the problem. -8(-4/7y-2)+5y=16. Distribute to get 67/7y+16=16 and then subtract 16 from both sides. Divide 67/7y by 67/7, so y=0. Substitute y=0 back in so x=-4/7(0)-2 so x=-2.
Ответ:
B
Step-by-step explanation: