Answer:
3x+4(2x+4) = 17
Substitute (2x+4) for y in the second equation
Step-by-step explanation:
Given the simultaneous equation;
y = 2x+4...(1)
3x+4y = 17...(2)
The most efficient first step to take is substituting equation 1 which is y = 2x+4 into equation 2 as shown.
3x+4(2x+4) = 17
This will reduce the two unknown in an equation to just one making it easier to find the single variable.
It will reduce the equation to:
3x+8x+16 = 17
11x+16 = 17.
Hence, this option below is correct
3x+4(2x+4) = 17
Substitute (2x+4) for y in the second equation.
