Question

How would you solve 4x+8y=-4,-5x+3y=-21 with substitution?

Answer 1

Answer:x =19\7 and y = 16\7

Step-by-step explanation:

Answer 2

We need to eliminate either x or y to solve the equation

So multiplying first equation by 5
20x+40y=-20---p

Multiply second equation by 4

-20x+12y=-84---q

Adding equation p and q

52y =-104
y=(-104/52)=-2
y=-2
Substitute y=-2 in 1st equation

4x+(8*-2)=-4
4x-16=-4
4x=16-4=12
x=3

Solution is
x=3 y=-2