what is the solution of the equation 4x +21 = -3
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Answer:
Step-by-step explanation:
// Solve equation [1] for the variable y
[1] y = -4x + 21
// Plug this in for variable y in equation [2]
[2] 3x - 4•(-4x+21) = 49
[2] 19x = 133
// Solve equation [2] for the variable x
[2] 19x = 133
[2] x = 7
// By now we know this much :
x = 7
y = -4x+21
// Use the x value to solve for y
y = -4(7)+21 = -7
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