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# I need to solve by substitution ?

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- DavidLv 71 month ago
If: 3x - 5y = 4 and y = 4x - 28

Then: 3x - 5(4x - 28) = 4 => 136 = 17x => x = 8

Solutions: x = 8 and y = 4

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- MichaelLv 71 month ago
y = 4x - 28

3x - 5y = 4

Substitute for y = 4x - 28

3x - 5(4x - 28) = 4

Distribute

3x - 20x + 140 = 4

Combine like terms

-17x = -136

Divide both sides by -17

x = 8 <–––––

plug in x = 8

y = 4(8) - 278

y = 32 - 28

y = 4 <–––––

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