Solve for y 2x+4y=21

Math
2x+4y=21
Subtract 2x from both sides of the equation.
4y=21-2x
Divide each term by 4 and simplify.
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Divide each term in 4y=21-2x by 4.
4y4=214+-2×4
Cancel the common factor of 4.
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Cancel the common factor.
4y4=214+-2×4
Divide y by 1.
y=214+-2×4
y=214+-2×4
Simplify each term.
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Cancel the common factor of -2 and 4.
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Factor 2 out of -2x.
y=214+2(-x)4
Cancel the common factors.
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Factor 2 out of 4.
y=214+2(-x)2(2)
Cancel the common factor.
y=214+2(-x)2⋅2
Rewrite the expression.
y=214+-x2
y=214+-x2
y=214+-x2
Move the negative in front of the fraction.
y=214-x2
y=214-x2
y=214-x2
Solve for y 2x+4y=21

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