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Terrydactly
29.01.2020 •
Mathematics
Solve the system of equations.
-4x+7y=20
y=3x+15
Solved
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Ответ:
Solve by Substitution :
// Solve equation [2] for the variable y
[2] 5y = 15x - 4
[2] y = 3x - 4/5
// Plug this in for variable y in equation [1]
[1] 15x - 20•(3x-4/5) = 7
[1] -45x = -9
// Solve equation [1] for the variable x
[1] 45x = 9
[1] x = 1/5
// By now we know this much :
x = 1/5
y = 3x-4/5
// Use the x value to solve for y
y = 3(1/5)-4/5 = -1/5
Solution :
{x,y} = {1/5,-1/5}
Ответ:
Simplify the expression.
−5n
Step-by-step explanation:
Hope this helps, If it did, then I would really appreciate it if you gave me Brainliest, I only need one more to rank up and it has taken forever to get to where I am currently. Thanks.