5x+2y=7. 4x+y=8 Systems of equations substitution method

1 answer
Question:

5x+2y=7.
4x+y=8
Systems of equations substitution method

Answers

Answer:x=3 and y=−4Step-by-step explanation: Solve4x+y=8for y: 4x+y=8 4x+y+−4x=8+−4x(Add -4x to both sides) y=−4x+8 Step: Substitute−4x+8 for y in 5x+2y=7: 5x+2y=7 5x+2(−4x+8)=7 −3x+16=7(Simplify both sides of the equation) −3x+16+−16=7+−16(Add -16 to both sides) −3x=−9 -3x/-3=-9/-3 (Divide both sides by -3)Step 2: Substitute 3 for x in y=−4x+8: y=−4x+8 y=(−4)(3)+8 y=−4(Simplify both sides of the equation)

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