Question

2x - 4y = 20
x =4
a. 4, -2
b. 4, 3
c. 4, 4
d. 4, -3

Answer 1

D. 4, -3 Because you plug in 4 for the x and 2•4 is 8, then you subtract 8 from both sides of the equal sign. (20-8=12) then you’re left with -4y = 12 divide by -4 on both sides of the equal sign, and y= -3 (and you’re already given the value of x)