Answer:
Answer:
x=−7 and y=0
Step-by-step explanation:
Step: Solve4x+y=−28for y:
4x+y=−28
4x+y+−4x=−28+−4x(Add -4x to both sides)
y=−4x−28
Step: Substitute−4x−28foryin−3x+10y=21:
−3x+10y=21
−3x+10(−4x−28)=21
−43x−280=21(Simplify both sides of the equation)
−43x−280+280=21+280(Add 280 to both sides)
−43x=301 −43x
−43
=
301
−43
(Divide both sides by -43)
x=−7
Step: Substitute−7forxiny=−4x−28:
y=−4x−28
y=(−4)(−7)−28
y=0(Simplify both sides of the equation)
