Question

using the substitution method how do you solve x+3y=90 y=3x

Answer 1

Write the first equation: x + 3y = 90
Observe the second equation is already solved for 'y'
Rewrite the first equation using the substitution defined. x + 3(3x) = 90
This gives a single equation that can be solved for x.
Multiply by 3 and obtain the value for y.

Answer 2

thank u