Solve the following systems of equations:
- 7x + y = 4
8x - 3y = 1
X=
y =

x=-1 y=-3

( − 1 , − 3 ) or x= − 1 , y = − 3

Step-by-step explanation:

Solve for the first variable in one of the equations, then substitute the result into the other equation.

Divide the number of robins by the number of cardinals for each pair of values. The ratios are the same and are a constant of proportionality of 3.