Question

Solve each system of equations by substitution:
X + Y = 75
10x + Y = 48

Answer 1

X= -3;

Y=78

Explanation:

A: X+Y=75

B: 10X+Y=48

B-A: (10X+Y)-(X+Y)=48-75

10X+Y-X-Y= - 27

9X=-27

X= -3;

Now

A is : -3+Y=75

Y=75+3=78