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3 years ago

y=5x+23, -2x-y=5 i need help with this, it’s solving by substitution. i don’t get it someone pls help

Mathematics

2 answers:

Anna71 [15]3 years ago

7 0

You just put the y=5x+23 in -2x-y=5
-2x-(5x+23)=5
-2x-5x-23=5
-7x=5+23
-7x=28
X=-4

madam [21]3 years ago

4 0

Answer: if this doesn't help u let me know and i can explain more have a good day <3

x=−4 and y=3

Step-by-step explanation:

Step: Solvey=5x+23for y:

y=5x+23

Step: Substitute5x+23foryin−2x−y=5:

−2x−y=5

−2x−(5x+23)=5

−7x−23=5(Simplify both sides of the equation)

−7x−23+23=5+23(Add 23 to both sides)

−7x=28

−7x/−7=28/−7

(Divide both sides by -7)

x=−4

Step: Substitute−4 for x in y=5x+23:

y=5x+23

y=(5)(−4)+23

y=3(Simplify both sides of the equation)

Answer:

x=−4 and y=3

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