Answer:
See below
Step-by-step explanation:
x = silk yards
y = cotton yards
y = 4.25 - x sub this in to the second equation
16.90 x + 4 ( 4.25 - x ) = 36.35
x = 1.50 yards of silk
y = 4.25 - 1.50 = 2.75 yards of cotton
