36.6k views
2 votes
How do I solve 4x+y=-28;-3x+10y=21

User Truncheon
by
8.5k points

1 Answer

5 votes

Answer:

Answer:

x=−7 and y=0

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)

User JoshuaJ
by
7.9k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.