you can try substitution
x-3(4x-9) = 16
x - 12x + 27 = 16
Didn't your question ask for a graphical solution?
so you have to find at least 2 ordered pairs for each equation and then draw them
for the first:
4x - y = 9 ---> y = 4x - 9
for the second:
x - 3y = 16 ---> x = 3y + 16
graph both lines, they should intersect at (1,-5), the answer chopsticks gave you.
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