Tomas is making trail mix using granola and walnuts. he can spend a total of $12 on the ingredients. he buys 3 pounds of
granola that costs $2.00 per pound. the walnuts cost $6 per pound. he uses the equation 2x+6y=12 to represent the total cost,
where x represents the number of pounds of granola and y represents the number of pounds of walnuts. he solves the
equation for y, the number of pounds of walnuts he can buy.
2x+6y=12
2(3) + 5y = 12
6+by+6=12+6
by = 18
y = 3
which is the first error that tomas made?
tomas substituted the 3 for x when he should have substituted 6 for x.
tomas added 6 to both sides of the equation instead of subtracting 6.
tomas should have written the equation as 3x+6y=12.
tomas substituted 3 for x when he should have substituted 3 for y.