Answer:
B. (4.75,-22)
Step-by-step explanation:
Step: Solve 3.2x+0.5y=4.2for x:
3.2x+0.5y=4.2
3.2x+0.5y+−0.5y=4.2+−0.5y(Add -0.5y to both sides)
3.2x=−0.5y+4.2
3.2x
3.2
=
−0.5y+4.2
3.2
(Divide both sides by 3.2)
x=−0.15625y+1.3125
Step: Substitute−0.15625y+1.3125 for x in−1.6x−0.5y=3.4:
−1.6x−0.5y=3.4
−1.6(−0.15625y+1.3125)−0.5y=3.4
−0.25y−2.1=3.4(Simplify both sides of the equation)
−0.25y−2.1+2.1=3.4+2.1(Add 2.1 to both sides)
−0.25y=5.5
−0.25y
−0.25
=
5.5
−0.25
(Divide both sides by -0.25)
y=−22
Step: Substitute−22 for y in x=−0.15625y+1.3125:
x=−0.15625y+1.3125
x=(−0.15625)(−22)+1.3125
x=4.75(Simplify both sides of the equation)
